based on this map en.wikipedia.org/wiki/File:Giza_pyramid_complex_(map).svg

and using this sphinx thingiverse.com/thing:15439

]]>and using this sphinx thingiverse.com/thing:15439

A small piece of railroad created for the Summer Youth Program at Michigan Tech.

]]>We were originally going to print it to take up most of the build platform on our MakerBot, but we decided the overhangs would probably droop without support so we scaled it down by a factor of 0.4. We may redesign this slightly so that we can actually embed it into a Plasticine/soil model of an authentic Acadian farming setup.

]]>A small duck for Neil's ISU project. This is the 2nd iteration. The first failed because it had no base, so the raft was very small and it ended up coming off the build plate before it was complete.

]]>Congratulations! You are now the proud owner of a Makerspace.

The Basic Makerspace Starter Kit includes:

MakerspaceWelcomeLetter.pdf

MakerspaceStarterKit1.pdf (Sign and free resource list)

MiniMakerNotebookv1.pdf

The Deluxe Makerspace Starter Kit aka the Gift Version adds either a laser cut or 3D printed makerspace sign.

MakerSpaceSignLaser.pdf for laser cutting on Epilog Zing.

MakerspaceSignTop3D.stl and MakerspaceSIgnBase3D.stl for 3D printing.

MakerspaceSignVector.svg to modify for material thickness.

The Workshop Makerspace Starter Kit aka Makerspace in a Bag includes all the previous items plus a 3D printed object, an LED throwie and other maker projects that can fit inside a plastic sandwich bag.

The idea of the Makerspace Starter Kit is to reduce the conceptual barrier to entry by changing the mindset from starting a makerspace to strategies for growing a makerspace.

Read more about the Makerspace Starter Kit at designmaketeach.com/2014/04/07/makerspace-starter-kit/

Please leave a comment or contact me on Twitter @DesignMakeTeach or on Facebook at Facebook.com/DesignMakeTeach. I love to talk with teachers, designers and makers about 3D printing, STEM and Learning by Making.

]]>The Basic Makerspace Starter Kit includes:

MakerspaceWelcomeLetter.pdf

MakerspaceStarterKit1.pdf (Sign and free resource list)

MiniMakerNotebookv1.pdf

The Deluxe Makerspace Starter Kit aka the Gift Version adds either a laser cut or 3D printed makerspace sign.

MakerSpaceSignLaser.pdf for laser cutting on Epilog Zing.

MakerspaceSignTop3D.stl and MakerspaceSIgnBase3D.stl for 3D printing.

MakerspaceSignVector.svg to modify for material thickness.

The Workshop Makerspace Starter Kit aka Makerspace in a Bag includes all the previous items plus a 3D printed object, an LED throwie and other maker projects that can fit inside a plastic sandwich bag.

The idea of the Makerspace Starter Kit is to reduce the conceptual barrier to entry by changing the mindset from starting a makerspace to strategies for growing a makerspace.

Read more about the Makerspace Starter Kit at designmaketeach.com/2014/04/07/makerspace-starter-kit/

Please leave a comment or contact me on Twitter @DesignMakeTeach or on Facebook at Facebook.com/DesignMakeTeach. I love to talk with teachers, designers and makers about 3D printing, STEM and Learning by Making.

What we know about Egypt's ancient civilization comes from what was left behind. Archaeologists scour the region for remnants to piece together pictures of the past, but some clues are hard to miss: at six and a half million ton, taller than the Statue of Liberty, and as wide as 10 football fields, the Great Pyramid of Giza can be seen from space.

Now with MakerBot's second curriculum unit, teachers and students, can download and 3D print their very own model for use in the classroom!

---

Infill: 3%

Shells: 2

Resolution: Standard

]]>Now with MakerBot's second curriculum unit, teachers and students, can download and 3D print their very own model for use in the classroom!

---

Infill: 3%

Shells: 2

Resolution: Standard

Make hydrogen at home with your very own electrolysis machine!

This device will allow you to separate the hydrogen from oxygen in water. Try it as a science experiment, to make hydrogen for balloons and airships, or just to set on fire!

]]>This device will allow you to separate the hydrogen from oxygen in water. Try it as a science experiment, to make hydrogen for balloons and airships, or just to set on fire!

Model of the Minerva logo for the University at Albany - SUNY. Minerva is the Roman goddess of wisdom and sponsor of arts, trade, and defense. She is the symbol of the university.

Design was built by the Informatics Department at the university. Printed using a student constructed PrintrBot Simple.

]]>Design was built by the Informatics Department at the university. Printed using a student constructed PrintrBot Simple.

3D printing is considered a transformational technology; however, its potential for configuring research laboratory equipment is nearly unprecedented. This project uses inexpensive and widely available electronic parts and a commercially available 3D printer to create a USB Powered Autostainer for Biological Specimens.

This platform uses two USB powered stepper motors (one turns the stain tanks into position under the slide and one dips the slide holding biological material into the stain tank), two stepper motor Driver boards, one Arduino UNO microcontroller, one LCD Shield and custom designed ABS plastic 3D printed structural components.

The microcontroller program polls buttons on the Shield to write a 5 step staining protocol. It is fully programmable from this LCD Shield user interface and does not need to be connected to a computer for program control. Each step is written into an element of an array for later program execution. The program first "Homes" the Dip and then the Tank stepper motor against limit switches. The program then executes each movement from the arrays which received the programming steps.

Future developments include inexpensive autostainer platforms for any high school program with access to a 3D printer as well as additional modules for the platform for example an auto-immunostainer or a Thermofoil heated Real Time PCR platform. Since the platform uses only USB power is conceivable that it could be powered by a small solar panel (for field research).

Automated Laberatory Equiptment

- Automated systems are essential in both education and in research.

- Essentially all laboratory equipment uses similar components (optics, fluidics, controlled movements, pneumatics and data management

- Using 3D printed parts and frames allows you to rapidly prototype low cost automated laboratory equipment for Educational uses and for field research.

- Being able to control the movements of automated systems in research or in education can be a tremendous advantage for creating automated systems

- Using USB power allows lower power consumption (USB 4.5 V and 100 mA)

- 3D printed prototype platforms can be Scalable, Modular and Expandable

Stain for Testing the System

Diff-Quik is a commercial Romanowsky stain variant, commonly used in histological staining to rapidly stain and differentiate a variety of smears, commonly blood and non-gynecological smears, including those of fine needle aspirates. It is based on a modification of the Wright Giemsa stain pioneered by Bernard Witlin in 1970. It has advantages over the older Wright Giemsa staining technique, as it reduces the 4 minute process into a simplified 15 second operation, and allows for selective increased eosinophilic or basophilic staining depending upon the time the smear is left in the staining solutions.

Diff-Quik is utilized on material which is air-dried prior to alcohol fixation .

Solutions required:

- Fixative (Fast green in methanol) - pale green colour

- Stain solution 1 (Eosin G in phosphate buffer) - red colour

- Stain solution 2 (Thiazine dye in phosphate buffer) - blue colour

Method:

- Allow smears to dry

- Dip slide five times, for one second each, into Fixative.

- Allow excess to drain after each dip.

- Dip slide or tape-strip five times, for one second each, into Stain

Configuration:

- A portable Up!3D printer was used to fabricate the 3D printed parts. The printer used the following parameters:

Z Resolution of 0.20mm, Base height 2 mm, Support Density 2 layers, 25% infill of parts interiors. The parts were printed using ABS plastic filament obtained form Octave.com. The parametric files for each object were saved in standard STL (stereolithography) file.

- The Arduino UNO Microcontroller was selected because it permitted an adequate number of digital inputs and outputs to control this prototype while allowing expansion for future development of related systems.

- The stepper motors needed to run with adequate force using USB power. The Steppers were wired as Bipolar motors and the Sparkfun Bipolar motor driver permitted control with the Arduino microcontroller.

- The entire system was designed for low cost (

]]>This platform uses two USB powered stepper motors (one turns the stain tanks into position under the slide and one dips the slide holding biological material into the stain tank), two stepper motor Driver boards, one Arduino UNO microcontroller, one LCD Shield and custom designed ABS plastic 3D printed structural components.

The microcontroller program polls buttons on the Shield to write a 5 step staining protocol. It is fully programmable from this LCD Shield user interface and does not need to be connected to a computer for program control. Each step is written into an element of an array for later program execution. The program first "Homes" the Dip and then the Tank stepper motor against limit switches. The program then executes each movement from the arrays which received the programming steps.

Future developments include inexpensive autostainer platforms for any high school program with access to a 3D printer as well as additional modules for the platform for example an auto-immunostainer or a Thermofoil heated Real Time PCR platform. Since the platform uses only USB power is conceivable that it could be powered by a small solar panel (for field research).

Automated Laberatory Equiptment

- Automated systems are essential in both education and in research.

- Essentially all laboratory equipment uses similar components (optics, fluidics, controlled movements, pneumatics and data management

- Using 3D printed parts and frames allows you to rapidly prototype low cost automated laboratory equipment for Educational uses and for field research.

- Being able to control the movements of automated systems in research or in education can be a tremendous advantage for creating automated systems

- Using USB power allows lower power consumption (USB 4.5 V and 100 mA)

- 3D printed prototype platforms can be Scalable, Modular and Expandable

Stain for Testing the System

Diff-Quik is a commercial Romanowsky stain variant, commonly used in histological staining to rapidly stain and differentiate a variety of smears, commonly blood and non-gynecological smears, including those of fine needle aspirates. It is based on a modification of the Wright Giemsa stain pioneered by Bernard Witlin in 1970. It has advantages over the older Wright Giemsa staining technique, as it reduces the 4 minute process into a simplified 15 second operation, and allows for selective increased eosinophilic or basophilic staining depending upon the time the smear is left in the staining solutions.

Diff-Quik is utilized on material which is air-dried prior to alcohol fixation .

Solutions required:

- Fixative (Fast green in methanol) - pale green colour

- Stain solution 1 (Eosin G in phosphate buffer) - red colour

- Stain solution 2 (Thiazine dye in phosphate buffer) - blue colour

Method:

- Allow smears to dry

- Dip slide five times, for one second each, into Fixative.

- Allow excess to drain after each dip.

- Dip slide or tape-strip five times, for one second each, into Stain

Configuration:

- A portable Up!3D printer was used to fabricate the 3D printed parts. The printer used the following parameters:

Z Resolution of 0.20mm, Base height 2 mm, Support Density 2 layers, 25% infill of parts interiors. The parts were printed using ABS plastic filament obtained form Octave.com. The parametric files for each object were saved in standard STL (stereolithography) file.

- The Arduino UNO Microcontroller was selected because it permitted an adequate number of digital inputs and outputs to control this prototype while allowing expansion for future development of related systems.

- The stepper motors needed to run with adequate force using USB power. The Steppers were wired as Bipolar motors and the Sparkfun Bipolar motor driver permitted control with the Arduino microcontroller.

- The entire system was designed for low cost (

[Seated Statue of Gudea](http://www.metmuseum.org/Collections/search-the-collections/30008819)

Neo-Sumerian Date: ca. 2090 B.C.

Geography: Mesopotamia, probably from Girsu (modern Tello)

Medium: Diorite

Dimensions: 17 3/8 x 8 1/2 x 11 5/8 in. (44 x 21.5 x 29.5 cm)

Classification: Stone-Sculpture-Inscribed

Accession Number: 59.2

Scanned by Isaac Budmen on 3/21/14

Printed in ABS & finished to look like stone

]]>Neo-Sumerian Date: ca. 2090 B.C.

Geography: Mesopotamia, probably from Girsu (modern Tello)

Medium: Diorite

Dimensions: 17 3/8 x 8 1/2 x 11 5/8 in. (44 x 21.5 x 29.5 cm)

Classification: Stone-Sculpture-Inscribed

Accession Number: 59.2

Scanned by Isaac Budmen on 3/21/14

Printed in ABS & finished to look like stone

Turn your cellphone into a microscope!

Use the lens from a cheap laser pointer to turn your phone into a microscope. This clip makes it quick and easy to mount the lens on your camera. Have a look at this [instructable](http://www.instructables.com/id/Macro-Lens-for-iPadiPhoneiPod/ "macro lens for iPad") to get the idea.

Use Customizer to make one to fit your phone. Don't forget to publish it so other people with the same phone can make it. The default setup is for an HTC Magic phone.

]]>Use the lens from a cheap laser pointer to turn your phone into a microscope. This clip makes it quick and easy to mount the lens on your camera. Have a look at this [instructable](http://www.instructables.com/id/Macro-Lens-for-iPadiPhoneiPod/ "macro lens for iPad") to get the idea.

Use Customizer to make one to fit your phone. Don't forget to publish it so other people with the same phone can make it. The default setup is for an HTC Magic phone.

Example of Clay 2 PLA middle school project.

Student create an object by hand in clay with tolerances and 3D printer limitations in mind.

The objects are then scanned using a Makerbot Digitizer and mass produced using a Makerbot Replicator 2

**This is an example of a clay cup created using lowfire white clay and glazed with food safe colors. The Digitizer still has a problem with cup openings (as seen in the original scan file) so the STL was imported into TinkerCad where a cylinder was used to hollow out the cup part and a cube was used to flatten the bottom for easier printing.**

]]>Student create an object by hand in clay with tolerances and 3D printer limitations in mind.

The objects are then scanned using a Makerbot Digitizer and mass produced using a Makerbot Replicator 2

**This is an example of a clay cup created using lowfire white clay and glazed with food safe colors. The Digitizer still has a problem with cup openings (as seen in the original scan file) so the STL was imported into TinkerCad where a cylinder was used to hollow out the cup part and a cube was used to flatten the bottom for easier printing.**

This is Day 16 of my collection of printable equations. To see the whole collection, go to: thingiverse.com/thing:227210

Continuing the series of polynomials today, with y = a*x^2 + b*x. Looks a bit like the Nike swoosh.

Details:

- units are in mm

- Range(x) = -50 to 50

- a = 1/25*.65, b = 2*.35

As always, I'm going to continue to post one equation per day until get bored or people lose interest. If there's a particular equation you'd like to see, leave a comment and I'll give it a shot.

]]>Continuing the series of polynomials today, with y = a*x^2 + b*x. Looks a bit like the Nike swoosh.

Details:

- units are in mm

- Range(x) = -50 to 50

- a = 1/25*.65, b = 2*.35

As always, I'm going to continue to post one equation per day until get bored or people lose interest. If there's a particular equation you'd like to see, leave a comment and I'll give it a shot.

This is Day 15 of my collection of printable equations. To see the whole collection, go to: thingiverse.com/thing:227210

I'm continuing the series of polynomials today, with y = x^3 .

Details:

- units are in mm

- Range(x) = -50 to 50

- a = 1/2500

As always, I'm going to continue to post one equation per day until get bored or people lose interest. If there's a particular equation you'd like to see, leave a comment and I'll give it a shot.

]]>I'm continuing the series of polynomials today, with y = x^3 .

Details:

- units are in mm

- Range(x) = -50 to 50

- a = 1/2500

As always, I'm going to continue to post one equation per day until get bored or people lose interest. If there's a particular equation you'd like to see, leave a comment and I'll give it a shot.

This is Day 14 of my collection of printable equations. To see the whole collection, go to: thingiverse.com/thing:227210

Continuing with the polynomials, today is a parabola, y = a*x^2.

Details:

- units are in mm

- Range(x) = -50 to 50

- a = 1/25

As always, I'm going to continue to post one equation per day until get bored or people lose interest. If there's a particular equation you'd like to see, leave a comment and I'll give it a shot.

]]>Continuing with the polynomials, today is a parabola, y = a*x^2.

Details:

- units are in mm

- Range(x) = -50 to 50

- a = 1/25

As always, I'm going to continue to post one equation per day until get bored or people lose interest. If there's a particular equation you'd like to see, leave a comment and I'll give it a shot.

This is Day 13 of my collection of printable equations. To see the whole collection, go to: thingiverse.com/thing:227210

Things are a little hectic this week, so I decided to go with something simple, a line, y = m*x+b (http://en.wikipedia.org/wiki/Line_(geometry)). M is the slope of the line, while b is the intercept on the y axis.

Details:

- units are in mm

- Range(x) = 0 to 100

- a = 1, b = 0

As always, I'm going to continue to post one equation per day until get bored or people lose interest. If there's a particular equation you'd like to see, leave a comment and I'll give it a shot.

]]>Things are a little hectic this week, so I decided to go with something simple, a line, y = m*x+b (http://en.wikipedia.org/wiki/Line_(geometry)). M is the slope of the line, while b is the intercept on the y axis.

Details:

- units are in mm

- Range(x) = 0 to 100

- a = 1, b = 0

As always, I'm going to continue to post one equation per day until get bored or people lose interest. If there's a particular equation you'd like to see, leave a comment and I'll give it a shot.

This is Day 12 of my collection of printable equations. To see the whole collection, go to: thingiverse.com/thing:227210

Things are a little hectic this week, so I decided to go with something simple, an ellipse (http://en.wikipedia.org/wiki/Ellipse). The equation is a variant of the circle (Day 8, x^2 + y^2 = a thingiverse.com/thing:233659), but with different divisors for x and y. So, x^2/a + y^2/b = 1. A and b control the maximum/minimum in the x and y direction, respectively.

Details:

- units are in mm

- Range(x) = 0 to 200

- a = 100^2, b = 50^2

As always, I'm going to continue to post one equation per day until get bored or people lose interest. If there's a particular equation you'd like to see, leave a comment and I'll give it a shot.

]]>Things are a little hectic this week, so I decided to go with something simple, an ellipse (http://en.wikipedia.org/wiki/Ellipse). The equation is a variant of the circle (Day 8, x^2 + y^2 = a thingiverse.com/thing:233659), but with different divisors for x and y. So, x^2/a + y^2/b = 1. A and b control the maximum/minimum in the x and y direction, respectively.

Details:

- units are in mm

- Range(x) = 0 to 200

- a = 100^2, b = 50^2

As always, I'm going to continue to post one equation per day until get bored or people lose interest. If there's a particular equation you'd like to see, leave a comment and I'll give it a shot.

This is Day 11 of my collection of printable equations. To see the whole collection, go to: thingiverse.com/thing:227210

Based on plastic's request in the comments, (http://www.thingiverse.com/thing:231587/#comments), for today's equation, I'm doing y = sin(cos(x/7)+sin(x))*x. I've included the Openscad file in case someone wants to modify the text or stand.

Details:

- There's a surprise guest in the pictures.

- units are in mm

- y scaled by 0.5 and x scaled by 1/9 to keep size reasonable

- Range(x) = 0 to 200

- I'm still using the original algorithm for creating the thick curve, which can produce artifacts at rapid changes in slope. I'm working on an improved algorithm that will filter out the artifacts, but haven't had time to finish it.

As always, I'm going to continue to post one equation per day until get bored or people lose interest. If there's a particular equation you'd like to see, leave a comment and I'll give it a shot.

]]>Based on plastic's request in the comments, (http://www.thingiverse.com/thing:231587/#comments), for today's equation, I'm doing y = sin(cos(x/7)+sin(x))*x. I've included the Openscad file in case someone wants to modify the text or stand.

Details:

- There's a surprise guest in the pictures.

- units are in mm

- y scaled by 0.5 and x scaled by 1/9 to keep size reasonable

- Range(x) = 0 to 200

- I'm still using the original algorithm for creating the thick curve, which can produce artifacts at rapid changes in slope. I'm working on an improved algorithm that will filter out the artifacts, but haven't had time to finish it.

As always, I'm going to continue to post one equation per day until get bored or people lose interest. If there's a particular equation you'd like to see, leave a comment and I'll give it a shot.

This is Day 10 of my collection of printable equations. To see the whole collection, go to: thingiverse.com/thing:227210

Based on gregsmith_to's request in the comments, (http://www.thingiverse.com/thing:227223/#comments), for today's equation, I'm doing the Sinc function, y = a*sin(b*x)/(b*x), which is used in signal processing (see en.wikipedia.org/wiki/Sinc_function). I've uploaded two different versions of the equation, with different ranges. Per another request, I've included the Openscad file in case someone wants to modify the text or stand.

Details:

- There's a surprise guest in the pictures.

- units are in mm

- a = 5000

- b = 1080/200 (1st), and 720/100 (2nd)

- Range(x) = 0.001 to 200 (1st), and 0.001 to 100 (2nd)

- I'm still using the original algorithm for creating the thick curve, which can produce artifacts at rapid changes in slope. I'm working on an improved algorithm that will filter out the artifacts, but haven't had time to finish it.

As always, I'm going to continue to post one equation per day until get bored or people lose interest. If there's a particular equation you'd like to see, leave a comment and I'll give it a shot.

]]>Based on gregsmith_to's request in the comments, (http://www.thingiverse.com/thing:227223/#comments), for today's equation, I'm doing the Sinc function, y = a*sin(b*x)/(b*x), which is used in signal processing (see en.wikipedia.org/wiki/Sinc_function). I've uploaded two different versions of the equation, with different ranges. Per another request, I've included the Openscad file in case someone wants to modify the text or stand.

Details:

- There's a surprise guest in the pictures.

- units are in mm

- a = 5000

- b = 1080/200 (1st), and 720/100 (2nd)

- Range(x) = 0.001 to 200 (1st), and 0.001 to 100 (2nd)

- I'm still using the original algorithm for creating the thick curve, which can produce artifacts at rapid changes in slope. I'm working on an improved algorithm that will filter out the artifacts, but haven't had time to finish it.

As always, I'm going to continue to post one equation per day until get bored or people lose interest. If there's a particular equation you'd like to see, leave a comment and I'll give it a shot.

A lithopane of Martin Luther King, Jr. in honor of his legacy in the pursuit of justice, freedom and equality.

The things we choose to design and print are indications of the things that we value and honor. What will you choose to contribute?

Customized version of thingiverse.com/thing:74322

A model of the Martin Luther King, Jr. Memorial can be found at thingiverse.com/thing:229463

Please leave a comment or contact me on Twitter @DesignMakeTeach or on Facebook at Facebook.com/DesignMakeTeach. I love to talk with teachers, designers and makers about 3D printing and Learning by Making.

]]>The things we choose to design and print are indications of the things that we value and honor. What will you choose to contribute?

Customized version of thingiverse.com/thing:74322

A model of the Martin Luther King, Jr. Memorial can be found at thingiverse.com/thing:229463

Please leave a comment or contact me on Twitter @DesignMakeTeach or on Facebook at Facebook.com/DesignMakeTeach. I love to talk with teachers, designers and makers about 3D printing and Learning by Making.

A very basic water wheel with a 3mm by 3mm square hole for a drive shaft a variation on the Water Wheel by JakeV

made this for my head of school for his daughter

]]>made this for my head of school for his daughter

**Educational Tool for teaching Fractions to the Blind.**

* Original design dates back to 1910 or earlier.

* Idea to recreate the design for 3D-printing by Golan Levin.

* Discovery of original design and CAD model by Martin Schneider.

Source: *http://Archive.org*

Alexander Mell, [ Der Blindenunterricht. Vorträge über Wesen, Methode und Ziel des Unterrichtes in der Blindenschule](https://archive.org/stream/derblindenunterr00alex#page/112/mode/1up), 1910

These tiles snap together to make polyhedra of any type you wish! Regular, semi-regular, truncated, stellated, or freaky; you decide.

Customize your own with the "Open in Customizer" button or download pre-made sets of compact or light Poly-Snap tiles. The compact tiles are the blue, white, and black ones in the main picture; they are sturdy and difficult to snap together, so they make very strong models you can toss around. The light tiles are larger and shown in the red picture; these are easier to take apart and put together and print up very quickly, but the models are a little less sturdy.

Depending on your printer and the filament, temperature, elevation from sea level, day of the week, etc, you may need different tolerances for your snaps; you can modify this in the Customizer.

A few technical notes and tips are listed in the Instructions tab.

A detailed walkthrough of how we used OpenSCAD to make these Poly-Snaps models will appear at the link below over the next week or so:

makerhome.blogspot.com (days 113-118)

]]>Customize your own with the "Open in Customizer" button or download pre-made sets of compact or light Poly-Snap tiles. The compact tiles are the blue, white, and black ones in the main picture; they are sturdy and difficult to snap together, so they make very strong models you can toss around. The light tiles are larger and shown in the red picture; these are easier to take apart and put together and print up very quickly, but the models are a little less sturdy.

Depending on your printer and the filament, temperature, elevation from sea level, day of the week, etc, you may need different tolerances for your snaps; you can modify this in the Customizer.

A few technical notes and tips are listed in the Instructions tab.

A detailed walkthrough of how we used OpenSCAD to make these Poly-Snaps models will appear at the link below over the next week or so:

makerhome.blogspot.com (days 113-118)

Part of my "#2 Pencil Series" that started with the my [#2 Pencil Rekenrek](http://www.thingiverse.com/thing:186080) I wanted to do a quick and easy project. Now kids, its NOT meant to be used as a missile. The aerodynamics are all wrong. But it will keep your pencil upright when you are in missing planning mode. And the nose can work for some hands as a pencil grip.

Note: when installing the base unit, go from the top. The hole is not large for the metal/eraser end to pass.

Also, the pieces from the [rekenrek](http://www.thingiverse.com/thing:186080) can be used with this as well for math games.

My [blog](http://www.dadhoc.com).

[Facebook](http://www.facebook.com/dadhoc)

[Twitter](http://www.twitter.com/dadhoc)

]]>Note: when installing the base unit, go from the top. The hole is not large for the metal/eraser end to pass.

Also, the pieces from the [rekenrek](http://www.thingiverse.com/thing:186080) can be used with this as well for math games.

My [blog](http://www.dadhoc.com).

[Facebook](http://www.facebook.com/dadhoc)

[Twitter](http://www.twitter.com/dadhoc)

Ein Wurmloch als moegliche Abkuerzung zwischen zwei weit entfernten Punkten.

Dieses 3D Modell zeigt, wie Massen, die in zwei verschiedenen Regionen des Universums Druck ausueben, sich schliesslich treffen und einen Wurmloch-Tunnel bilden koennten.

]]>Dieses 3D Modell zeigt, wie Massen, die in zwei verschiedenen Regionen des Universums Druck ausueben, sich schliesslich treffen und einen Wurmloch-Tunnel bilden koennten.

**UPDATE** I tried printing a few of these last week and the fit is way off. Feel free to tinker with them and share updates. I'm not sure when I will get a chance to revisit these. Sorry.

I designed these fraction prisms for the **MakerBot Academy Math Manipulative Challenge**. #makerbotacademymath

I call them **Euclidean Shards** because

A. They look like shards and

B. I got the idea from the [Euclidean Algorithm](http://en.wikipedia.org/wiki/Euclidean_algorithm), which calculates for the highest common factor

**Goal**

**These shards aim to teach students fraction addition and subtraction, and the relationships between fractions.** All the while utilizing all three dimensions that a 3D printer allows.

My goal was also to create objects that are beautiful and eye-catching by design.

**The concept is (somewhat) simple:**

Each prism side is a fraction of a foot. On one shard/prism you will have three sides which are all consecutively half the length of the longer side. The base isosceles triangle on the flat base of the prism has one side which is the shortest length of the prism, and two which are the shorter length of the prism.

*For example*, the 1/3 shard will have a side that is a 1/3 feet, 1/6 feet, and 1/12 feet. Then the base isosceles will have a side that is a 1/12 feet and two sides which are 1/6 feet.

**Example of usage:**

Take the picture shown in the gallery of a 1/7 side of a shard laid down next to a 1/4 side of a shard. A student can then solve for 1/7 + 1/4 by trial and error or by using the shards to confirm their answer. In this case 11 of the 1/28 sides will line up perfectly and show that 1/7 + 1/4 = 11/28.

In this example, 28 can be a hard least common denominator to arrive at if one is unfamiliar with fractions, but now it becomes more intuitive because 1/28 is on the same shard as the 1/7.

In addition to teaching fractions these shards can aid in teaching measurements because they are all fractions of a foot/12 inches.

The shards are stackable and the design files include a case.

]]>I designed these fraction prisms for the **MakerBot Academy Math Manipulative Challenge**. #makerbotacademymath

I call them **Euclidean Shards** because

A. They look like shards and

B. I got the idea from the [Euclidean Algorithm](http://en.wikipedia.org/wiki/Euclidean_algorithm), which calculates for the highest common factor

**Goal**

**These shards aim to teach students fraction addition and subtraction, and the relationships between fractions.** All the while utilizing all three dimensions that a 3D printer allows.

My goal was also to create objects that are beautiful and eye-catching by design.

**The concept is (somewhat) simple:**

Each prism side is a fraction of a foot. On one shard/prism you will have three sides which are all consecutively half the length of the longer side. The base isosceles triangle on the flat base of the prism has one side which is the shortest length of the prism, and two which are the shorter length of the prism.

*For example*, the 1/3 shard will have a side that is a 1/3 feet, 1/6 feet, and 1/12 feet. Then the base isosceles will have a side that is a 1/12 feet and two sides which are 1/6 feet.

**Example of usage:**

Take the picture shown in the gallery of a 1/7 side of a shard laid down next to a 1/4 side of a shard. A student can then solve for 1/7 + 1/4 by trial and error or by using the shards to confirm their answer. In this case 11 of the 1/28 sides will line up perfectly and show that 1/7 + 1/4 = 11/28.

In this example, 28 can be a hard least common denominator to arrive at if one is unfamiliar with fractions, but now it becomes more intuitive because 1/28 is on the same shard as the 1/7.

In addition to teaching fractions these shards can aid in teaching measurements because they are all fractions of a foot/12 inches.

The shards are stackable and the design files include a case.

After consulting some math teachers, they told me that teaching the cartesian plane is difficult to do with all three axes. A whiteboard or chalkboard cannot show the Z axis. This model can show all three and be drawn on by a dry erase marker to demonstrate the three dimensional world. This can also teach students about their MakerBot and how to design accordingly.

]]>The rekenrek is a abacus-like math learning tool that both my kids have used in their early math education.

This version was designed to be easily assembled with a #2 pencil. The racks can be attached to each other with small nibs.

Typically, a rekenrek has two rows with ten beads (2 color groups of 5) that are fixed. But with this design, kids can add and remove the beads, depending on the exercise and complexity level. The beads range from 1-10 sides, representing different numbers.

You can position multiple racks horizontally or vertically, and incorporate any number of beads for a fun range of exercises around number concepts, addition, subtraction, as well as multiplication.

Since #2 pencils might be scarce in many classrooms, there's a small hole at either end (with grooves on the bottom and sides) for a string.

Note: the pieces are uploaded individually as it gives the most flexibility for grouping prints. The pieces are listed with their numbers as "w" for with number and "wo" for without number. Figured I'd just give folks the choice.

More info [on my blog](http://www.dadhoc.com).

[Facebook](http://www.facebook.com/dadhoc)

[Twitter](http://www.twitter.com/dadhoc)

Lots of Rekenrek activities can be found [here](http://www.k-5mathteachingresources.com/Rekenrek.html).

]]>This version was designed to be easily assembled with a #2 pencil. The racks can be attached to each other with small nibs.

Typically, a rekenrek has two rows with ten beads (2 color groups of 5) that are fixed. But with this design, kids can add and remove the beads, depending on the exercise and complexity level. The beads range from 1-10 sides, representing different numbers.

You can position multiple racks horizontally or vertically, and incorporate any number of beads for a fun range of exercises around number concepts, addition, subtraction, as well as multiplication.

Since #2 pencils might be scarce in many classrooms, there's a small hole at either end (with grooves on the bottom and sides) for a string.

Note: the pieces are uploaded individually as it gives the most flexibility for grouping prints. The pieces are listed with their numbers as "w" for with number and "wo" for without number. Figured I'd just give folks the choice.

More info [on my blog](http://www.dadhoc.com).

[Facebook](http://www.facebook.com/dadhoc)

[Twitter](http://www.twitter.com/dadhoc)

Lots of Rekenrek activities can be found [here](http://www.k-5mathteachingresources.com/Rekenrek.html).

NEW VERSION!!! POSTED 12-29-13

At first glance the updates are barely noticeable, but every piece has been revised. The changes make assembly easier with better fit and smoother operation.

This Math manipulative is designed to appear playful from the first look. It lies flat on desk top, so it will also work well with overhead projection systems.

Behind the mechanical fun there are several simple ratio exercises. The eight tooth "Idler" gear is supplied to add reverse rotation without affecting the ratios. Each interchangeable gear has built-in graphics to indicate the number of teeth as well as rotation position. Some gear ratio formulas can be found here: en.wikipedia.org/wiki/Gear_ratio.

Rubber bands provide tension to keep the wheels engaged no matter what the combination.

FYI, the "T" on the gears stands for "teeth".

]]>At first glance the updates are barely noticeable, but every piece has been revised. The changes make assembly easier with better fit and smoother operation.

This Math manipulative is designed to appear playful from the first look. It lies flat on desk top, so it will also work well with overhead projection systems.

Behind the mechanical fun there are several simple ratio exercises. The eight tooth "Idler" gear is supplied to add reverse rotation without affecting the ratios. Each interchangeable gear has built-in graphics to indicate the number of teeth as well as rotation position. Some gear ratio formulas can be found here: en.wikipedia.org/wiki/Gear_ratio.

Rubber bands provide tension to keep the wheels engaged no matter what the combination.

FYI, the "T" on the gears stands for "teeth".

This is a simple but effective way to teach anybody equivalency of fractions! By utilizing 10 rows made up of different sizes of blocks, a student can re-arrange it in anyway! For example, they can move 5 of the 5/10 blocks into the 1/2 row and vice versa. By hands on showing the students the physical equivalents and the over all value represented by each row, where one row has the total value of 1 and then the square is filled it represents 10! Simple, effective, safe, and easy to use!

** Note: All printers are different, so print quality will very in the area of blocks fitting nicely. I would recommend sanding each block a bit on each side so they fit snuggly.**

]]>** Note: All printers are different, so print quality will very in the area of blocks fitting nicely. I would recommend sanding each block a bit on each side so they fit snuggly.**