Mushroom knob for Round shaft 4.0 mm - 4 sizes 20/25/30/36 mm, no supports

A domed head on a slim neck - it sits in the palm rather than between the fingers. The neck carries the hub, so on thick shafts this form starts one size up. 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 | |---|---|---|---| | 20 mm | 13.6 mm | 2.1 cm³ | 2.7 g | | 25 mm | 15.5 mm | 3.0 cm³ | 3.8 g | | 30 mm | 18.6 mm | 4.5 cm³ | 5.7 g | | 36 mm | 22.3 mm | 6.7 cm³ | 8.6 g | Bore measure…

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