Maker Select Universal Spool Holder

I wasn't able to fit a Taulman 3D nylon spool on the stock maker select and I didn't like that many designs needed spool adapters, so I went ahead and designed my own that fits all spools I have ever come across without any adapters. The top pole mount is a spline at the bottom so that all spools should stay roughly centered, regardless of size.

I have uploaded the .step files if anyone would like to modify the files. The originals were done in Solidworks. The dimensions of the bearing ma