I have a nice three string Loog guitar. The neck is pretty small, so I designed and printed my own wall hook for it. (Also, folks, I am not affiliated with Loog beyond being a happy customer!)

My main goal was to make a wall hook for my guitar that would keep all parts of the guitar from rubbing against the wall, while being strong enough for me to trust it. I didn't want "explosive delamination" to send my guitar to the floor. I used a static load of 3 times the weight of my guitar hanging from the hook to test the strength, and it lasted more than a week without any visible deformation. I included a photo of my test setup.

I took a few CAD classes in college, but all my 3D printing experience before this had been with OpenSCAD. This was my first project using Fusion 360.

I wrote more about this project at my blog, Feels Like Burning.

Notes:

Please, please increase the infill, and do testing before you hang your wonderful guitar using this!