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reprap cube - speed optimized, big built aerea, replicating

by goaran, published

reprap cube - speed optimized, big built aerea, replicating by goaran Sep 13, 2012

Description

This in another reprap derivat printer. The main idea to built it was to get a printer which is fast and has lots of space to build things. The x and y axis work with an etch-a-sketch kind of mechanism with two belts. The z axis is driven by 3 thread rods. The main frame is a cube built of 20mm extruded aluminium profile. my frame is 400x400x400 but this can be scaled as you like.
The extruder i designed for the printer is that one: thingiverse.com/thing:14311 and the electronics i use are these: thingiverse.com/thing:6480
The pulleys were rendere with the scad script by droftarts: thingiverse.com/thing:16627 thanks a lot for that. Except for the frame,the rods and some standard parts, all parts are printed. (The edge-connecters could be printed too, this can be extended here)
UPDATE: i connected the stepper drivers and the other electronix for the axis today and did some first axis-tests. There is a video on vimeo:
vimeo.com/50614766 and another one where also the z-axis is moving every few seconds after a layer is finished (it is printing the squirrel thing with honeycomb infill)
youtube.com/watch?v=989PFsqJshA
I had it running without an extruder just to test if the axis go as fast as i want them to run (which they do). For printing i think the speed will have to be reduced. Next thin will be the endstops, and finally the extruder.

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hy JerryLutor,

i do not have a list of all the parts. However it is not that much extra parts that you need.

12x extruded Aluminium Profile 20x20 mm. mine is 400mm in length but you can scale it if you want.
3x 8mm threaded rod and nuts for the z-axis
3x nema 23 motors
the timing belts and wheels i got from maedler.de which is a good source if you are located in germany, but there should be similar shops all over the worls. depending on the length of the extruded aluminium profiles you need different belt lengts. (there is a java-script belt length calculator on the maedler site)
the belt profile is T2,5 wide 6mm
i replaced the two belt-pulleys that drive the xy axis with 60 teeth ones (those in the picture are 21 teeth) to get a better resolution in xy direction)
the pulley on the z axis is also 60 teeth
therefore you need 4x60 teeth and 13x21teeth if i did not forget any.
i made a new version of the printer, however it is not published yet. if you want to build it please let me know so you can get the improved parts. further there is a new extruder hot end i made: robotik.dyyyh.de/dual-bowden-extruder/ and a new extruder driver as well, that is also not published yet.
the bearings are 21x8x6 mm (8mm hole) and the linear bearings are teflon coted sliding bearings (lm8uu kind bearings will not work since the axis in the bearing is rotated, further they are very loud)
the axis are 8mm polished/hardened steel ones.
if you have additional questions please let me know.
I liked your printer and I would like to repeat it, do not you have a list Dellal? I was particularly interested in the belts that you use.
nope sorry, dont have a BOM, the lentgth of the extruded aluminium is 400m (20x20mm) The smooth rod is 8mm and the threaded one is M8 length depends on the size of the cube (a bit less than 400mm in my case)

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hy JerryLutor,

i do not have a list of all the parts. However it is not that much extra parts that you need.

12x extruded Aluminium Profile 20x20 mm. mine is 400mm in length but you can scale it if you want.
3x 8mm threaded rod and nuts for the z-axis
3x nema 23 motors
the timing belts and wheels i got from maedler.de which is a good source if you are located in germany, but there should be similar shops all over the worls. depending on the length of the extruded aluminium profiles you need different belt lengts. (there is a java-script belt length calculator on the maedler site)
the belt profile is T2,5 wide 6mm
i replaced the two belt-pulleys that drive the xy axis with 60 teeth ones (those in the picture are 21 teeth) to get a better resolution in xy direction)
the pulley on the z axis is also 60 teeth
therefore you need 4x60 teeth and 13x21teeth if i did not forget any.
i made a new version of the printer, however it is not published yet. if you want to build it please let me know so you can get the improved parts. further there is a new extruder hot end i made: robotik.dyyyh.de/dual-bowden-extruder/ and a new extruder driver as well, that is also not published yet.
the bearings are 21x8x6 mm (8mm hole) and the linear bearings are teflon coted sliding bearings (lm8uu kind bearings will not work since the axis in the bearing is rotated, further they are very loud)
the axis are 8mm polished/hardened steel ones.
if you have additional questions please let me know.
I liked your printer and I would like to repeat it, do not you have a list Dellal? I was particularly interested in the belts that you use.
nope sorry, dont have a BOM, the lentgth of the extruded aluminium is 400m (20x20mm) The smooth rod is 8mm and the threaded one is M8 length depends on the size of the cube (a bit less than 400mm in my case)
Do you have a BOM ?
What is the size.length used for the smooth and threaded used in your build?
I absolutely love the design, not only does it look like it would scale very nicely, but it has a nice mechanical feel to it too.
im making something similar, but i have a few extra nema 17s, so ill be using two nema 17s per axis, one on each side. also my frame will be 580x520x520. 580 tall. and im using 2040 and 404020, which is like an L shaped 2040 beam for added structural integrity.
i just checked the diameter in Meshlab and it is 8mm. (the one that goes in vertical direction in the stl
The big hole with the drop has a diameter of 13.4
I did not use LM8UU for these axis but slide bearings because LM8UU are really noisy when moved fast.
What tool did you use for slicing? Did you calibrate your perimeter width?
I print an AxisSlider, but find out that the 8mm rod or linear bearing 608 do not fit. Then I measure the hole along the long side to find it is about 7mm, not the 8mm. Is there something wrong about my printing? I wish to more details. 
Today i mounted the stepper drivers so there will a be a video of it running soon
http://disqus.com/thingiverse-492114f6915a69aa3dd005aa4233ef51/ if you want to build one and need some additional info please let me know. 
gonna build one like this using ultimaker electronics
the 3rd axis is driven by a belt which connects the 3rd one with one of the two others. I will add a picture tomorrow where you can see this.

the build area is about 300x300x200mm with the 400mm frame.

I did not print on it yet , as soon as i get any prints ill post some pictures / video
Cool - the 3 Z-axis design is clever. I was considering doing something similar, but centering the 3rd axis on the build plate - and using separate steppers that could auto-level the table.

Post some printing results! Let us know how fast it goes!
Looks great, whats the build area?
How does the 3rd z axis get it's motion? The photo only shows the stepper at the bottom controlling 2 z axis threaded rods. How is your print quality and speed?
I believe that only two of the corners for the z-axis are threaded rods. The other two are just sliders. So only 2 need to be driven by the motor.
Yes, but the project description says " z axis is driven by 3 thread rods"
Well, Rroofl's* z-mechanism could be "easily" adopted for that purpose, it's just a matter of a moment in your favorite CAD-environment I suppose. ;)

* reprap.org/wiki/Rroofl
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