I was constantly looking for my Logitech Z313 volume knob as it was moving around my desk. I designed this holder with OpenSCAD to store the volume knob controller tightly on my standing desk tablet.

The version provided fit snugly on my 16-ish mm tablet, and everything is parametrable to fit your custom needs.

I decided to print it at a 30° angle to reduce the need of support and add a bit of strenght to the material, although I'm not sure this is required (see the included GCODE file).