Magnetic screw dish
thingiverse
I had some extremely weak ceramic permanent magnets (16.75mm x 3.75mm) lying around (the kind you find in a cheap plastic shower liner). This small dish has a 17mm-diameter hole in the bottom that fits one of those magnets (tightly). Toss screws, LEDs, or other little iron-containing parts in there while you work. If you have slightly different needs (deeper/shallower/wider dish, different sized magnet) you can [tweak the Onshape source](https://cad.onshape.com/documents/33c4c3bb2a82815d9294ac02/w/daea12fdf83db2cce00131d4/e/36ceb5d3a8e2ef7cb51a69fd).
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