Printrbot Jr Y Axis Belt Tensioner
by thejim, published
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.
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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.