I've been meaning to design & print a working grinder that doesn't leave bits of plastic in the mix....
Saw a design that took from flour mill...Plus grinding plates, read the reviews, it sounds as though it needed another iteration / quality control check.
Improving upon the original, I've produced a similar design for you lovely, smokey printer fanatics - print in wood pla for a fantastic finish!
It literally pulverizes and obliterates evenly up to 2g of herb within three turns.
Please read the Print settings and see the image for assembly guidelines.
3D PRINTING SETTINGS
For a complete gRINDER you will need to print:
1x Top Case
1x Bottom Case - Leaf OR Heart (the Heart is a TM of 420ThreeD)
Print the Case's together on 2xshells 0%infill
Print the Grinder file separately: 3xshells 15%infil (min), top layers: 5
I cannot stress the 3x shells and 15% MIN infil enough, you don't want a holey print.
Although over 25% is EXCESSIVE and it just wastes filament / time / money.
15% is great