Drum knob for Round shaft 6.0 mm - 4 sizes 16/20/25/30 mm, no supports

A tall drum with round ribs. All that shell area is what makes a slow, fine turn possible - volume, feed, focus. For plain 6 mm shafts without a flat. Holds with an M3 grub screw that cuts its own thread - no brass insert, no tapping. ## Sizes in the download All 4 diameters, same shaft fitting: | Diameter | Height | Volume | Weight in PETG | |---|---|---|---| | 16 mm | 17.6 mm | 2.7 cm³ | 3.4 g | | 20 mm | 19.0 mm | 4.1 cm³ | 5.2 g | | 25 mm | 23.8 mm | 6.7 cm³ | 8.5 g | | 30 mm | 28.5 mm | 9.…

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