Removable Folding Spool Arm for Lulzbot Mini

When we built the enclosure for our Lulzbot Mini 3D printer, we needed to replace the stock pivoting spool holder, so we designed a bracket to mount a removable spool arm. The first version was just a hack (literally - we hack sawed the bottom off the stock arm, and made it removable, with the printable bracket we designed. We also made a printable version of this where we hacked off the bottom in OpenSCAD.

But we were never really happy with that solution, so here is an improved spool arm.