I needed a simple, foolproof little rack to dry out my mouthpiece after washing it. For daily use I don't like those enclosed cases that come with them. Wanted something that would eliminate contact with the countertop and minimize contact with the mouthpiece to keep things sanitary.

Tried other solutions, but ran across a design for 2 cutting boards from efliq (below) that I remixed by slicing off half and squeezing/stretching to fit the piece in Orca Slicer. A bonus is tolerance for placement so you can just drop in your mouth guard and it'll be fine without fiddling the position - sliding it left/right still won't allow contact with the countertop for my piece.

Close-up, it looks a little bumpy and rough - that comes from randomizing the layer line and I find it grippier than a regular line.

For me, this is perfect, but you should be able to adjust as necessary within your slicer. Hope somebody else finds this useful.