Variation of the Auto Rewind Spool Holder to be used on the SnapMaker spool holder rod.
Used with an A350, It will probably work with the smaller versions of the SnapMaker 2.

This will cure the problem of the filament coming off the reel when the machine moves to home.

Default setup is for a small spool with a 32mm dia hole (generally good idea to do it this way even if you don't have a small diameter spool), and adapter for a 64mm wide spool with a 53mm dia hole.

The secondSpoolInnerDiameter and secondSpoolWidth are the 2 settings to change for different spool adapters.
Once you've created the basic set of parts (spring, hub, protector, tabpin) then create as many different adapters as you need.

It was suggested that I should include a set of stl files, since most of them will be what are needed for an A350. There are files for a 32mm dia hub (smallest spool I have), and adapters for the 3 other spools sizes I have. Adapter-32-{dia}x{width}

SnapMaker A350

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No

Modified the original Auto Rewind Spool Holder to wind the spring in the opposite direction, added notch/pin to hold the spring to the back plate, and added a tab and pin to lock it to the A350 support arm.