Dome knob for Round shaft 5/16 in (7.9375 mm) - 4 sizes 20/25/30/36 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. 5/16 inch is 7.9375 mm. The nearest metric shaft is 8 mm, and a knob bored for 8 sits loose on this one - six hundredths sound like nothing until the knob wobbles. ## Sizes in the download All 4 diameters, same shaft fitting: | Diameter | Height | Volume | Weight in PETG | |---|---|---|---| | 20 mm | 19.6 mm | 3.4 cm³ | 4.3 g | | 25 mm | 19.…

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