Ball 85 mm with M4 tap hole – tap your own thread, flat base

A 85 mm ball with an M4 tap hole – tap the thread by hand, then screw it onto an M4 screw or rod. M4 is too fine to print; a cut thread holds better. **Uses:** cap for M4 screws and threaded rods; finial on an M4 threaded pin. ## Dimensions (measured on the CAD solid) | | mm | |---|---| | Ball Ø / height on the base | 85 / 82.57 | | Flat base Ø | 28.33 | | Tap hole Ø in the model | 3.5 for M4 | | Usable depth / cone tip | 35 / 36.75 | ## Cutting the thread Modelled at 3.5 mm, as printed holes c…

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