Buy a printed copy for around 10 bucks with shipping https://www.etsy.com/listing/685474787/toothless-60mm-3d-printed-herb-grinder
Inspired by http://www.thingiverse.com/thing:2107631 designed by guerillacaterpillar
4 Piece grinder with catchment tray that will last hundreds of years
This has been remixed from 74mm to only about 60mm, (see 4th picture)
after lots of trial and error everything can be printed at standard 100% scale and should fit snugly.
OPTIONAL: if you have a 3d printer pen make a small line of plastic on the Tray where it meets the housing. this will prevent the bottom from falling off. (see 5th picture)
(updated bottom bowl, file was mildly corrupted)
0.1mm to 0.3mm Works Fantastic
The Top and Grinding Plate should be printed at medium density (20%) with thick walls.
The Tray and Housing can be printed at low density (5-10%).