Spool Holder for CR-10. The main reason for the spool holder is to provide smooth and easy rotation without needing to replace any OEM parts. It fits over the stock 32 mm threaded pipe. It can adapt to any spool with a center hole of 40 mm to 70 mm inner diameter. It will also center the spool to allow for smoother rotation.
The photo shows two different revisions (Latest and In-Progress) Latest version has rounded corners to make tightening easier on the hands.
Note: If you have trouble getting the nut all the way over the bolt, just shave a little material from the inner lip on the large side of the nut. This will happen if you get a "smushy" first layer.