Untested whiskey glass for 18mm ball bearing
thingiverse
I have not tested this at all, print at your own risk. The glass rim is wide enough that you may need to print with support. Obviously, print the "top" upside down and the "bottom" right side up. Unless I messed up the fit tolerance they should come together with a bit of force. You want to put an 18mm diameter steel ball bearing in between before you put them together. This is probably not food safe without some post-printing processing which I'm not aware of. Don't do anything stupid.
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