Summary

Some spools (looking at you, Fiberlogy) have a slight curve on the inside of the roll, which makes them wander around and even fall off when using the original straight roller. The curve in this model fixes this issue and makes even oddly shaped rolls run without issue.

This file only contains the roller model, the holder can be found in the original thing at https://www.thingiverse.com/thing:3209211/remixes