Drum knob for Round shaft 8.0 mm - 4 sizes 20/25/30/36 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 8 mm shafts, held by an M4 grub screw. ## Sizes in the download All 4 diameters, same shaft fitting: | Diameter | Height | Volume | Weight in PETG | |---|---|---|---| | 20 mm | 19.6 mm | 4.2 cm³ | 5.3 g | | 25 mm | 23.8 mm | 6.8 cm³ | 8.6 g | | 30 mm | 28.5 mm | 10.1 cm³ | 12.8 g | | 36 mm | 34.2 mm | 14.8 cm³ | 18.8 g | Bore measured on the finished solid: 8.20 × 8.20 mm.…

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