This is a slightly more challenging variant of Dovetail Triangle that only opens when held in a certain orientation.

Watch the video for a demonstration:

youtube.com/watch?v=JnMRREjfPyc

The rubber band powered penny launcher is a staple of engineering inter office warfare. Although it could just be the graduate student research group setting. In any case I saw a few similar disc launcher things but nothing that really suited my needs. This is just a simple version I quickly tossed together. The range is easily across the lab using standard rubber bands double wrapped on each side.

For those not in the US, the penny is about 19mm across and 1.55mm thick.

I made these simple little hooks to fix a broken washing hanger, but they turned out to be pretty useful for other stuff too. They can be linked together to make a chain. Maybe useful for filament or cable guide. If you attach one end to a rubber band and tie it to your bot somewhere then clip the filament into the other end of the hook, the hook can be used to gently guide your filament.

Home wind turbine based on a NACA 4412's profile with an optimized twisting

A filament guide suspended by 4 elastic bands in the central space at the top of your MakerBot. I have the MakerBot Filament Spool Holder (thing:7105) mounted on top of my bot, which works great, but without a little guidance I find the filament feeds off the reel at too steep an angle which causes friction. This guide gently pulls the filament into the center above the extruder and the natural curve of the filament elevates the point at which it leaves the reel.

Here are all the 3D printed parts for the RepRapPro Ltd version of Huxley. Despite what it says on the left, it was primarily created by Jean-Marc Giacalone. I added a few bits...

This is a pretty useful shotglass featuring high volume, a solid stand and mostly important numbers from 1 to 8 which are pretty necessary for counting drinks, useful in drinking games and whatever.

This is a derivative of timogiles’ original “6 Packer” model. Specifically, this started as his design, generated for 1/8" material. I then hand-optimized the pieces to allow parts to better share cut lines. Finally, I (barely) squeezed it to fit on to two 24" x 12" boards.

This design also inclues an etched QR code directing people to the downloadable files.

Simple single S-hook (derivative of HeadFull design). Its not fancy but it works for plastic bags and over bench tools in the Lab...

Yes, they chain together beautifully.

This is a 3 by 3 array of circle knots. The base unit comes from this website: cs.duke.edu/~edels/Tubes/knots/circ/index.html

Tweaked meirm's Stackable Polygons to:

1) Make the OpenSCAD code more parametric and commented (i.e. replaced numbers with variables and equations).
2) Made the ends of the 'bones' rounded, to make them easier to slide onto the 'polygons'.

Meirm did the hard math, and the polygons were already parametric (number of slots).

Attached are STL files for polygons with 6 and 8 slots, and 'bones' length 20 mm and 40 mm.

Here is a template to cut some eyeglass / sunglass frames from a laser cutter.

This is for opening beer, and only beer.

The JCPC (Jim Cielinski PlastiC) is a pedal from the BMX company Odyssey (http://www.odysseybmx.com) and design/invented by George French from G-sport (http://www.gsportbmx.com), part of odyssey.

It is a plastic version of the original Jim cielencki pedal, a freestyle bmx rider who rides for the pro team of odyssey, and is world wide recognized by bmx riders for his pedal grinds.

What makes this pedal so special, is that it exists out of 2 plastic halves around a metal spindle that acts as a bearing for the whole pedal. the screws that hold both halves together are also the pins that provide grip to the pedal. and the best part, if you grind threw 1 side, you can just buy plastic halves and don't need to buy 2 new pedals.

The design i did does not have the concave for as the original, but is flat, so you have more space to grind on, and allows you to easy add a piece of aluminium or steel on the bottom of your pedal. (or titanium if you want sparks!)

Bracket to mount a 2.5" Hard Drive or an SSD Hard Drive into a 3.5" hard drive bay

Carrier for 4 22oz bottles.

Small trees to be printed with no support

build structure out of parametric stackable polygons.

One of the things I've been trying to do is print a pulley with a captive nyloc nut. However, the pulleys in PrusaJr's and Greg Frost's github pages, and the ones on thingiverse, all have some problems. Mostly it's that they are not parametric, or not openscad, or just stl, or rely on other files (Prusa's and Greg's) for some reason. So, as a way to get into learning OpenSCAD, I took Giles Bathgate's openscad copy thingiverse.com/thing:3104 of nophead's original thingiverse.com/thing:2079, and the latest one from Prusa's github github.com/prusajr/PrusaMendel mashed them up and tweaked extensively with the following:

• fully parametric, allows any size of pulley base, length of pulley teeth, number of teeth (see note below), number of captive nuts, size of captive nuts and a few other things besides (constants are at the beginning, currently, rather than using configuration.scad)
• new parameters for:
- nut trap shape - allows hex or square nuts to be accommodated
- nut depth - can be edited for different nut types ie nyloc
- pulley base height - can be set to 0 for no pulley base
- pulley base diameter
- pulley teeth height
- number of captive nuts
- angle between captive nuts
• changing motor shaft size doesn't change the shaft cylinder outer dimension (weird mistake?)
• nut trap now parametised with nut size, and is consistent with opening (sides are smooth)
• can have a belt retainer on the open end of the pulley, made with a 45º ramp, to keep wandering belts on the pulley (not tested, can be turned off)
• grub screw hole altered for better printing
• no other file/library dependencies (I thought this was useful as this part often get reprinted on its own)

Update
• parameters for different tooth shape (T5 and XL specified)
• option for T5 or XL pulleys; amend tooth profile parameters and uncomment relevant part for correct tooth spacing
• space between shaft and captive nut is adjustable (triffid_hunter)
• belt retainer height is adjustable (triffid_hunter)

The scad files can be used to create a wide variety of pulleys and toothed idler sprockets, I've made a few different STLs to show, but in the end it's far better to download the scad file and make your own.

Description of included three scad files:
"pulley-T5-8_old_tooth.scad": does NOT have parametric number of teeth, it is fixed at 8 teeth. Everything else is still parametric. The teeth are the same size and spacing as the Prusa/Giles Bathgate/nophead version, which has generally proven reliable.

"pulley-T5-N_old_tooth.scad": you can specify how many teeth you want, however choosing 8 teeth creates a pulley that is slightly smaller (about 0.7mm) in diameter than the Prusa version. The tooth profile is still the same as the original tooth profile from the nophead version.

"pulley-T5-XL-N_tooth.scad": is fully parametric, and uses a tooth profile that is defined by parameters, which allows for T5 or XL shaped-teeth. The tooth shape is subtracted from the pulley, unlike the original version, which is additive. I have included a couple of files for comparison, called "T5-tooth-comparison" scad and stl. The basic difference is that the original version has longer tooth spurs, but the angle of the tooth ramp is incorrect. You can adjust .scad file for deeper teeth, but if there is too much clearance you will get lash from the pulley. The attached STL files are generally sized with a small amount of tolerance, rather than being exact fit. "rtnr" means the pulley has a belt retainer on the end. All pulleys have a 3mm hole for an M3 grub screw, and a slot for a M3 nyloc captive nut. The wall outside of the nyloc nut might be a bit thin for a lot of pressure on the grub screw on the 8-tooth versions.

Regarding tooth spacing: the relationship between the outside diameter of the pulley teeth and the number of teeth is not linear. I took the data for pulley teeth outside diameter from cmtco.com/catalog/tp_mt.html#T5 and sdp-si.com/D265/HTML/D265T016.html put it in Excel and graphed the difference of pulley OD over number of teeth. After a few attempts at manually extrapolating the formula from the curve, I used the trial version of CurveExpert Basic from curveexpert.net/download/ which quickly deduced a formula. This is all shown in the attached excel file. I slightly simplified the formula, added it to the scad file, adjusted the tooth placement and it seems to generate accurately sized pulleys. But the size of the 8-tooth pulley is extrapolated from the end of the curve, and I have nothing to check its diameter is accurate, as 8-tooth pulleys aren't commercially available as it bends T5 belting beyond it's specification. I did the same for XL belt. I can add more variations if there is any interest, eg T2.5, T10, MXL, 40DP, L.
HTD and GT2 belts have rounded teeth, so will require a different method of creating the tooth profile.

Any observations, comments and/or suggestion for additions or further improvement gratefully received.

This is the Quantum ORD Bot. It is 3D printer mech platform made from MakerSlide linear bearing. It is extremly ridged and very easy to build. The design can easily be scaled in X,Y and/or Z by simply changing the Makerslide lengths plus belt and leadscrew lengths. This is the mini or 'Quantum' version. The parts other than MakerSlide are either off the shelf standard items or easily fabricate with a laser cutter, 3D printer or CNC router. There is a blog post giving a lot more detail.

buildlog.net/blog/2012/01/the-quantum-ord-bot/

As a reference point, this size uses less than $15 worth of Makerslide extrusion. You also need about $45 worth of MakerSlide wheels, spacers, etc. The Makerslide parts are available at the MakerSlide store. Be aware the rail is released in weekly 'production batches' and sells out very quickly. It is 'restocked' on weekly basis.

I have attached the complete 3D design in STEP format plus a DXF of the flat parts. If I can generate enough interest, I may have about 50 sets of parts fabricated and offer kits. That would be for the mechatronics platform only. The extruder, electronics, etc would not be included.

Why spend $200 for a set of printed parts when you can have everything you see here, including motors, belts, pulleys for about $200?

Planned changes.
1. I plan to change the crossbar handle thing to an extrusion to make it more scalable.
2. The 'quantum' design currently uses NEMA14 motors. I plan to tweak the parts to be compatible with NEMA17. This just adds a second pattern to some parts.

This thing will create a range of metric and imperial tooth profile pulleys, with any number of teeth, specified in the Openscad file.
Tooth profiles currently supported are MXL, 40DP, XL, H, T2.5, T5, T10, AT5, HTD (3mm, 5mm, 8mm) and GT2 (2mm, 3mm 5mm).
There are a range of editable parameters for editing the fit of the tooth (to account for printer variation), the pulley base, captive nut(s) slot for the set screw, motor shaft diameter, pulley height and belt retainers.
The attached stls are reference pulleys, mostly around the size used on repraps.

Details
After creating the parametric pulley thingiverse.com/thing:11256 I realised this way of modelling them was only going to work for square-toothed pulleys, and a way of producing pulleys for belts with better characteristics for linear motion was required. I found dxf drawings of the relevant tooth profiles here oem.cadregister.com/asp/PPOW_Entry.asp?company=915217&elementID=07807803/METRIC/URETH/WV0025/F and modelled pulley diameter from data here sdp-si.com/D265/HTML/D265T016.html
There were a couple of possible approaches to importing the data, I chose to simplify the bezier curve dxf data in Inkscape, producing vertices with a resolution of around 0.05-0.1mm for each tooth. Another advantage is the the pulleys have the tooth ramp for smooth entry and exit of the belt tooth into the pulley. I'm not really sure 3D printers can take full advantage of this yet, but quality is improving all the time!
If other tooth profiles are required, or you model any, please pass them on to me and I will include them.
Not printed yet... I'm away for the weekend! I'll upload some photos when I do, on Monday.

One is not enough. Need lots. This is just a handful of them for simplified printing in bulk.

Bones here: thingiverse.com/thing:16856

I am going to have family over during Christmas for dinner, so what better way to show off my Huxley then by making my own napkin rings!

One side (unfortunately the side you can't see on the render) has the shape of a holly leaf on it, or at least what I can draw as a holly leaf!

CdnRepRap's LM8UU holder was just what I've been looking for - every other holder I've tried has been very fragile for me.
However, it was set up for metric screws and was not in a format I could easily modify.

So here's an SCAD implementation. It's done as a module so it can easily be tacked onto other objects. I put them on Greg's X carriage in about 10 minutes (I'll post this later after I print a test one).

This is a fresh implementation made by just printing one of the original objects, measuring it and bashing it out in SCAD. Enjoy.

Cylon Raider ship from the newer Battlestar Galactica series.

Make sure you have no wireless network devices nearby when this Cylon is printed; these toasters can infiltrate a network in seconds. And they have a plan....

Greetings Starfighter! You have [once again, but this time in higher detail] been recruited by the Star League to defend the Frontier against Xur and the Ko-Dan armada. Get ready! Prepare for blast-off.

This is an Hi Poly version of the Gunstar from The Last Starfighter, which I guess makes the previous model a beta unit.... And that brings us to Lesson Number Two... You've got a good thing going here. Keep smiling, don't blow it.

This is a clip for hanging things from curtain rods. It grips the hanging object, and fits over a 20-30mm rod.

hold the toothpick as a sword and fight for that olive.
:)

This is a design I made to cut shapes into icing on our Christmas cake. It's about 100mm across, and will cut into thin icing - it might work for cookie dough, although I haven't tried.

I designed this in Sketchup, so have included the source file as well as the exported, and printable STL file.

Snowflake for Christmas Tree

This snowflake can be used to hang on your Christmas tree, door, window, on your desk lamp or wherever a snowflake is needed.

Print with a 0.35mm nozzle gives good results - didn't test it with a 0.5mm nozzle.