Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

Printrbot Jr Y Axis Belt Tensioner

by thejim, published

Printrbot Jr Y Axis Belt Tensioner by thejim Jan 3, 2013
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I crafted this replacement for the Printrbot Jr's y-axis end cap to include a belt tensioner after being inspired by things http://www.thingiverse.com/thing:10274 and http://www.thingiverse.com/thing:13479.

The .stl file is an export of the .scad file configured for 6-32 screws and nuts, but feel free to fiddle with the parameters to customize it if necessary.


You'll need four (4) screws and three (3) nuts to assemble this thing. It was created for use with 6-32 screws/nuts, but the .scad file should allow for easy adjusting if necessary. The screw at the bottom, the one that triggers the y-end stop, should thread into the part from the back. The screws at the top for the plunger and belt clamp should slide through the part and be engaged by the captured nuts on the back.

You'll need the shapes.scad file for the hexagon() module.

I'm still getting my Printrbot Jr fully calibrated, but this printed out really well for me. If you notice anything that needs to be adjusted, please comment below and let me know.

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Im getting the same problem as aharris, and Im using repetier-Host 0.85

I receive a "NAN Value in STL file import "error. Any ideas??

Hmm... I haven't experienced that. It's been a while since I've fiddled with this model, though. What software are you using to process it? Have you tried using the scad file to recreate the stl?

I printed and installed this. It works very well. My belt is a guitar string. My only upgrade would be make the tension nub a half sphere instead of a half cylinder.

i made some changes so i can use metric screws (M4). printed and look fine.

Excellent. Let me know how it fits.

Thank you thejim ! Perfect for my Printrbot Jr.
Like nepaholic, now we need to find something for the x axis. Thank you very much if something come soon.

look good, i try to print it. now we need to find something for the x axis :P

I've been thinking about that, too. Will try modeling something soon.