I designed some quick, and easy to print hooks and arms for my Ikea pegboards.
There are 2 different sized hooks, and 4 different sized arms. The longer arms are reinforced with a diagonal member.
I print them with enough walls to make them solid, (usually 5) so infill in not necessary.
I have not done any strength tests, but i print mine in PLA and have not had any issues with breaking.
The author marked this model as their own original creation.