This is a remix of the popular tool by @fivesixzero. I did have to edit the M2.5 & M2 insert sizes to fit these inserts. This also includes placement for up to 4 8x3 magnets. You can also hang this if you don't want to fiddle with the magnets. I did print this using a 0.6mm nozzle and it works OK, but the letters/numbers would probably come out better on a 0.4mm nozzle. I did choose a font that is rounded to make it a bit easier as well. I sliced this with Prusa Slicer and a color change for the letters/numbers.