I wanted to replace an existing hook with a 3D printed hook and reuse the holes in the wall.
In addition, it should be reasonably robust because a heavy bag (with used glass) will hang on it.
So...two conditions: strong and with adjustable distance between the mounting holes.

And to make it reusable, I designed it for the Customizer.

Here is an extended version (as a remix), in which the strength of the back wall can be adjusted also.