Elegoo rotating spool holder NO METAL PARTS Needed Neptune 3 plus may fit others.

thingiverse

Neptune 3 Spool holder, NO METAL PARTS NEEDED, no bearing or threaded rod, Just print and use. Tip, you may have to sand/file down the seam that the printer leaves on the inner spindle. Based an idea from the excellent XMAN_Prints spool holder. One on the left in the picture is XMAN_Prints spool holder, The one on the right is mine, no bearing or metal rod is needed.