S-hook designed for to holder 3/4 inch PVC pipe for spools. I haven't fully tested the strength , but it can hold five 1 kg spools per two hooks.
I printed these with 4 top, bottom, and side layers
I am also using spool spacers someone created here: https://www.thingiverse.com/make:325482
SFilamentHook.stl | 115.1KB |