IKEA IVAR Filament spool hook

Used for hanging ≤ 1 kg spools onto the sides of the popular IVAR shelves sold at IKEA.

Print two pieces. Use an 8 mm round rod or M8 threaded rod for hanging the rolls. I've combined it with premium skateboard 608ZZ bearings and spool adapters for almost completely silent operation.

Because almost all of the tensile forces are taken up by the walls, infill doesn't really matter. Print with at least three or four walls, and reduce infill just to ensure the top layers can be easily printed.

Inspired by https://www.thingiverse.com/thing:4311905