M3 knurled thumb knob
A knurl knob for a finger-tight M3 screw on a panel or a printer bed: push a hardware-store M3 bolt into the hex pocket and it becomes a hand-tightened fastener. The pocket faces up when it prints, so there are no supports or bridges; a drop of CA glue holds the hex if it ever loosens.
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Specifications
| Hardware | M3 bolt head, DIN 933/934 hex |
|---|---|
| Style | knurled thumb wheel |
| Height | 12 mm |
| Diameter | table default for the size (25 to 52 mm) |
Printing
- Prints top-down as exported: hex pocket faces up, no supports or bridges.
- Push the hex in cold; a drop of CA glue beats reaming the pocket loose.
- Thread the bolt through before seating the head.