Parametric Bolt Knobs (OpenSCAD) – 36 Styles + Fillets + Countersink

Make your bolts less boring. This is a fully parametric OpenSCAD generator for bolt knobs with 36 grip styles, optional filleted edges, and an optional countersunk entry.

Features

• 36 knob styles (swap instantly with a dropdown)
• Accurate bolt hole sizing (depth + diameter behave correctly in slicers)
• Optional fillets (radius adjustable)
• Optional countersink (top or bottom, adjustable depth/diameter

How to use

1. Open the .scad in OpenSCAD
2. Pick a shape in the dropdown
3. Set knob diameter/height, hole diameter, hole depth
4. (Optional) enable fillets and/or countersink
5. Render (F6) → Export STL