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Makergear x carriage with LM8UU bearings

by fittoextrude, published

Makergear x carriage with LM8UU bearings by fittoextrude Jan 23, 2012
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Summary

This thing is a derivative of
the v2 X carriage found on the Github/Makergear/file repository. This design is modified to fit LM8UU bearings. This x carriage fits a Makergear extruder or bowden cable adapter.

Credit goes to Xnaron's "snap in holder" design for inspiration. The carriage should fit a regular Prusa Mendel as well.

I have included the Alibre design file for those who have access to this program.

Instructions

For best results, use a raft and suppport as it will be printed on its side.

Press fit four LM8UU linear bearings.
Press fit 4mm hex nuts into the holes for the belt clamp.

Currently, the fit of the bearings is snug, not tight. Too tighten more
you can warm the plastic and squeeze the cylinder before you re-insert the
bearing. The bottom of the cylinders are slotted for that purpose. Or as someone has suggested you can drill a hole and tighten them with screws. You can also clamp the outside of the cylinders with zipties or
by other means of your choosing. Last but not least, just a bit of epoxy
in the slot with the bearing inserted would probably do the job.

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Looks great but I wish I had realized it wouldn't work out of the box with my x-ends. Have to find an lm8uu x-end with the old (facing backwards) motor orientation.

Also, which part is the corresponding belt clamp? I don't see anything in the makergear prusa github and the regular prusa clamp is too small :(
At least a rectangle with holes in it is about my openscad skill level!

The belt clamp consist of two printed rectangles with 4.3 mm holes, 15 mm apart.

A great free tool for measuring STL files is a piece of software called Minimagics, if you want to find out the real dimensions of your object. I was under the impression that those pieces were in the Github. I will draft up a pair to print and will add the stl file. Thanks for noticing.

Thanks for the dimensions. I bodged this together and it works fine. Next is a screw-tensioner!

For anyone else, copy and paste this into openscad:

module beltclamp(){
difference(){
cube([23,10,4]);
translate(v = [4, 5, 0]){
cylinder(h=10, r=2.15, $fn=9, center=true);
translate(v = [15, 0, 0]) cylinder(h=10, r=2.15, $fn=9, center=true);
}}
}
beltclamp();

Instead of making the bearing holes smaller... how about just putting a screw in the side of them to hold them in place?

That would be prettier, but a dedicated hole for that would be stronger, unless you print at a solid infill setting. Another option is clamping

from the outside with zipties. There is a 40mm fan mount on thingiverse that includes seperate clamps tightend with a bolt and nut. It would probably fit

the diameter of this design as well. Lots of options, thanks for the suggestion.

I speculate that both a raft AND support may be needed. Or, am I misunderstanding its print attitude?

You are correct, I printed it with a raft and support. Thanks for letting me know.

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