A non-standard gridfinity watchmaker's tray that I made for my dad.

It's technically out of gridfinity spec in the sense that it's only 1U tall, so the cups themselves cut rather deep into the base (there's only 1mm of plastic on the bottom), leaving no room for magnets or other standard hardware inserts. I figured this was a worthwhile tradeoff, as magnets are very bad for watchmaking components anyway, and I wanted to keep this as slim as possible.

The cups are 5mm deep, and there should be 1mm of clearance between the top of the cups and the bottom of a tray stacked above it. The bottom of the tray being so thin means that it prints with good clarity in transparent plastics, even with relatively bad settings.

As always, the FreeCAD design file is included if you want to mess with this yourself.