Auto-Rewind Spool Holder (remake for MMU under shelf holders)

thingiverse

I made the square end stop attachable to the spring, so it works seamlessly with my spool holders without needing a cable tie. It prints as one cohesive piece. The link to the rest of my Spool holder design is available here: https://www.thingiverse.com/thing:3248102 *** Update *** On May 8th, 2019, I added new Spool and Spring files that allow them to fit together snugly without requiring glue. For me, they were a tight fit, but if you find yours loose, just apply some glue to the rim. To print these updated designs, use the files Spool v3.stl and Spring v3.stl. Note: You'll need to select "Detect Thin Walls" for optimal printing results.