Hypercube X carriage bushing with POM/acetal filament inserts

This is a printable bushing for the X carriage of the Hypercube 3D printer by Tech2c and it's intended for use with carbon fiber tubes; it's a replacement for the original dual bushing holder and the expensive Igus bushings.

Instead of trying the almost impossible task of printing new bushings entirely on POM, I made this one so I could just insert POM/Acetal/Delrin filament sections into PLA printed bushings. I decided to make 4 slots in 90 degrees spiral, so the carbon fiber tubes I'm using on the X axis are completely covered in their circumference.

I included a parametric OpenSCAD file, so you can adapt it to your needs (not all carbon fiber tubes are made equal). After printing and assembly, I had some bushings that were a bit tight on the tubes; to fix it I quickly passed a hot carbon fiber tube (10mm) back and forth inside the bushing in order to improve fitting. You could also try to find your ideal parameters in the file through trial and error.

After a couple of mont