420chan.org styled grinder cover
myminifactory
This is sized right now to fit a 30mm grinder (made in China, buy on ebay or alibaba) but you can scale it up to whatever you want. The crush ribs are designed to be crushed as you smash the metal grinder part in there, and that, plus some epoxy glue, will keep you going just fine.
Download Model from myminifactory
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