Monoprice MP Select Mini BB Spool Holder

At what point does something stop being a "remix" and become its own thing? I don't know, but this design incorporates elements of thing 1636941, thing 1989704 and my own work added in 123Design and TinkerCAD.

Here are the links to the original items:

MP Select Mini small spool holder by rixkix:
http://www.thingiverse.com/thing:1636941

Fillament Holder (For Kossel Alt) by Homexperts:
http://www.thingiverse.com/thing:1989704

It is a remix? A mashup? I don't know, but I can't take sole credit for a design that is more other people's work than my own.

With that said, there are a ton of filament holders for the Monoprice MP Select Mini 3D printer, and none of them met my expectations. Some were close, some were only for "mini" rolls, some just didn't work well.

This holder is about the same size as the stock filament holder and uses the factory mount. This filament holder uses ball bearings so the filament rolls out freely, has guides to keep the spool in place and is