I had a iron frame with M12 screws for leveling. Wanted a moisture protection for the screws and a protector / larger base for the floor.

I opted for PTEG and a tight fit (use a hammer gently if needed or slightly scale up in BambuStudio) so the bases don't fall off while moving the frame around.

If you need different sizes take the OpenSCAD file and change 1 or two numbers. its a 4 liner excluding the comments. ;)