Round knob serrated outside for better gripping

ConcaveKnob Settings

diameterDiameter of the knob (mm)
serrationsNumber of serrations
roundedAmount of circumference used for non convex parts
angleAngle between convex and concave parts
boltholeDiameter of the bolt hole (mm)
dholeD-Flat in fraction of the diameter
hexheadWidth of the hex bolt head (mm)

Default Settings

thicknessthickness of the material
format format of resulting file
tabswidth of tabs holding th parts in place (not supported everywhere)
debug print surrounding boxes for some structures
referenceprint reference rectangle with given length
burnburn correction in mm (bigger values for tighter fit)