When you're all done, the ice ball maker should operate like shown above. Perfect ice balls!
Wondering how I got such clear ice to start with? Then check out my other Instructable, how to make crystal clear blocks of ice.
Attached are some very basic AutoCAD files of my design. They contain the original 125x125x75 mm block and the same block with a hemisphere carved into it. You should be able to import these into your CAM program (like SprutCAM), but I recommend starting from scratch to understand the whole process flow.