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 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. 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) 1x Grinder Print the Case's together on 2xshells 0%infill Print the Grinder file separately: 3xshells 15%infil (min), top layers: 3 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 Happy Slicing!