This is a replacement knob for the Capresso Infinity Grinder. Mine broke so I modeled this as close as I could to the original. It's slightly wiggly but I've been using it daily for almost a year now with no issues. Enjoy!

Update 2/11/18: Added the 123D Design File if you're interesting in making improvements. The height could be brought down just a tad and the strength of the legs could be improved.

I used a piece of aluminum from a can to form a replacement metal bar that fits to the internal gear. You can reuse your original if you don't lose it like me.