I needet a hook that could be used on the side of my staircase. So the top must be tilted to match the angle of the staircase. I couldn't find one that fits my needs. It was inspired by https://www.thingiverse.com/thing:3020490 but I created it from scratch.

I made it in OpenSCAD. For some unknown reasons it has problems with exactly 45°. Maybe someone can tell me why.

Depending on the printer and the angle you might need support.