This is a redesigned Huxley inspired by the Prusa simplified Mendel.
It uses the PLA Bushings like
I modified the scad script to use 6mm rods.
(basically just put in 6mm for rod size and 12mm for width)
I have also redesigned the X and Y motor brackets to be able to use nema 14 or 17 motors. The Z now takes 2 nema 14 motors.
I designed it around 1/4" threaded rods and #6-32 bolts. It should work with 6mm rods and M6 bolts, but I'm not sure.
This should work with the same extruder as the regular Huxley. I believe.
The image is of the current build status, it needs the Y Stage and some belts on it before it will go, and an extruder. But the Z movement is working well so far.
Edit: Got the belts in and installed on the X Axis
Test Videos here
The design files are in SolidWorks
Edit 12-8-10: Found a problem with the X-axis parts.
the bolts used to tighten the rods in place had a nut bigger than the rod, so I put in a slot on the side. This weakened the structure to the point where tightening the bolts enough to keep tension on the belt, it would break the piece. I redesigned them after finding "Undersized Hex Nuts" (McMaster carr part 90760A007 for 6-32) which allow me to insert them the same as prusajr originally had. I also added more material to the sides to help with this. I am currently printing them out for testing.
Edit 12-9-10: I added more material to the x-axis parts to make them a bit stiffer again, I didnt get a chance to test the last version, so it may work just fine.
Print out a bunch of stuff and put it together how it makes sense :)
Found out somebody did a nice writeup for the fullsize one, which should be pretty similar to this one.
BOM: This does not include and of the extruder parts
X motor : Nema 14 or 17 x1
Y motor : Nema 14 or 17 x1
Z motors : Nema 14 x2
Enough bolts to attach the motors(M3 on mine)
6-32 1/2" bolts x22
6-32 nuts x22
1/4-20 nuts x A Bunch
1/4" washers x A Bunch
1/4" Fender Washers x 6
1/4" bearing x3
(I dont know the part number right now but they are 0.625" OD, which is like 16mm if your building in metric)
Edit: Current Bar sizes are as follows
Triangle frame threaded rod = 10" x6
Bottom across frame threaded rod = 8" x4
Top across frame threaded rod = 12" x2
Z bottom support threaded rod = 12" x1
Z Threaded movement rod = 8" x2
Z smooth rod = 9" x2
X & Y smooth rod = 11" x4
These are just because I got the smooth rod out of some old printers, and scaled the rest around them. All these dimensions should be able to be scaled up pretty easily. I should be able to get about a 6"x6"x4" printable area.
Kind of important
I attached the Z drive rods with some pieces of aluminum rod that I drilled through at 5mm and tapped halfway with 1/4-20. And then put a set screw in the side to hold it to the motor shaft. Im trying to make a printable version of this and still have it be as straight.
Here are instructions on how to put together the Z spring loaded antibacklash nut contraption
You will need a nut that is drilled out just bigger than your rod, like this one