Newer design available: Universal Auto-Rewind Spool Holder!
Filament load/unload issues? MMU2 taking too much space? Not with this Parametric Auto-Rewind spool holder! It keeps filament on the spool during unloading, up to eight full revolutions.
This is a remake of the original Auto-Rewind Spool Holder, but with significant enhancements:
Fully parametric
Default spring size 100mm gives up to eight rewinding revolutions
Metal bearings can be used, but also works fine without any bearings
No tape or zip-ties needed
Compatible with existing spool stands with 8mm axle slots
Spring blades in the hub keep the spool pressed against the backplate for adequate friction and prevention of spool sliding off the hub
Adapter allows to mount differently-sized spools on the same hub
Spacers included to keep hub in place
Spring guard included
How it works:

Enter your spool's inner diameter and width in the parameters for reference spool (you can do that in the Customizer app, link is on this page, or download OpenSCAD yourself).…