Dome knob for Round shaft 4.0 mm - 4 sizes 16/20/25/30 mm, no supports

A dome over a knurled band. The dome is deliberately flatter than a hemisphere: a true half-sphere would print at 65 degrees of overhang and need supports. For plain 4 mm shafts, held by an M3 grub screw. ## Sizes in the download All 4 diameters, same shaft fitting: | Diameter | Height | Volume | Weight in PETG | |---|---|---|---| | 16 mm | 13.6 mm | 1.8 cm³ | 2.3 g | | 20 mm | 13.6 mm | 2.3 cm³ | 2.9 g | | 25 mm | 16.5 mm | 3.6 cm³ | 4.6 g | | 30 mm | 19.8 mm | 5.3 cm³ | 6.7 g | Bore measured…

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