Drum knob for Round shaft 4.0 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 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 | 15.2 mm | 2.4 cm³ | 3.0 g | | 20 mm | 19.0 mm | 4.0 cm³ | 5.1 g | | 25 mm | 23.8 mm | 6.5 cm³ | 8.3 g | | 30 mm | 28.5 mm | 9.7 cm³ | 12.4 g | Bore measured on the finished solid: 4.20 × 4.20 mm. ##…

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