Dome knob with hex nut pocket M3 - clamping knob, 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. Takes a DIN 934 hex nut M3 from the back - the thread is steel, not printed plastic, so it survives being done up hard. The bolt runs right through, so its length does not matter. M3 is the size for camera plates, small jigs and enclosure lids. ## Sizes in the download All 4 diameters, same shaft fitting: | Diameter | Height | Volume | Weigh…

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