Polyterra Spool insert
thingiverse
This is to reduce wear on the spool holder. I love Polyterra and their mission with that product but it was wearing grooves in my spool holders so something had to change. Push these into the spool. They're reusable and will save the spool holder from being eaten away at and jamming from friction.
Download Model from thingiverse
With this file you will be able to print Polyterra Spool insert with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Polyterra Spool insert.