***** BEWARE: before you print this part, make sure you measure the outside diameter of the spool holder arm on your printer, several people have printed this part only to find out it doesn't fit their printer spool holder arm, it seems Creality used different diameter metal stock on their printers, I've heard comments that this is for the first generation of CR-10's.
If you decide you still want to print it and don't have a caliper to measure your spool holder arm diameter, then save yourself from disappointment and do the right thing: print just handful of layers, stop your print and make sure whatever you printed fits your spool holder arm.
I couldn't find a suitable bushing or holder adapter for the stock arm on the Creality CR-10 so i created this one on Fusion 360, the threads are virtually play free and i didn't alter sizes for tolerance, off the plate it threaded with no effort whatsoever, it actually cleaned all the fuzzies my current PETG leaves behind.
The adapter runs the length of the arm and holds the large spools i have firmly in place while rotating without effort, for much smaller spools like the one that comes with the printer i invert the female and it fits them perfectly.
I might add a hex or some sort of wings in the near future to help remove the nut since it fits very snug on the spools.
If you print and use this and run into spools with a larger than 60mm diameter and dont want or know how to alter it, let me know and i'll be happy to update it.
If you print it, please share your results, thank you.
Sliced with Simplify3D
-0.4 nozzle at 60mm/s with a 50% outline underspeed for outter most layer.
-concentric 20% infill
-4 top and bottom layers and 3 perimeter shells
-PETG at 250/70 - extruder/bed and fan on