Ball 80 mm with M3 tap hole – tap your own thread, flat base

A 80 mm ball with an M3 tap hole – tap the thread by hand, then screw it onto an M3 screw or rod. M3 is too fine to print; a cut thread holds better. **Uses:** cap for M3 screws and threaded rods; finial on an M3 threaded pin. ## Dimensions (measured on the CAD solid) | | mm | |---|---| | Ball Ø / height on the base | 80 / 77.71 | | Flat base Ø | 26.67 | | Tap hole Ø in the model | 2.7 for M3 | | Usable depth / cone tip | 30 / 31.35 | ## Cutting the thread Modelled at 2.7 mm, as printed holes c…

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