Here is a quick release cam lock for your filament spools. Flip the lever up and it slides right off. Flip the lever down and the spool cannot walk down the threaded rod. Works great and is a quick print. This was designed for a 6mm threaded rod. Let me know if you need a different size. 8mm has now been included.

Printed with PLA at 100% fill. Sliced using Cura. Use 3mm hardware for the pivot pin.