HerbGrinder

This is a grinder I made a while back. It has a separate side that the crushed herbs fall into. There are spots for a 4mmx4mm square magnet, pay attention to the polarity when you glue these in. The plates are interchangeable but the first one is probably the best for most things. You can print out multiple trays to grind different things into different trays, there is even a tray lid for keeping herb fresh.

Works best with herbs that aren't too moist.