Replacement parts

A knob that fits the shaft

Measure the shaft with a caliper, pick a body and a grip. For potentiometers, rotary encoders, amplifiers, fans and cooker valves. Prints without supports.

Starting point

Shaft

Shaft diameter, mm

Flat to opposite side, mm

Bore depth, mm

Fit clearance0.10 mm

Added all round the shaft. 0.1 mm is a firm push fit on most printers; go up if it will not go on, down to 0 for a press fit.

Set screw hole — through the side, onto the shaft

Body

Diameter20 mm

At the top18 mm

Height18 mm

Top edge1.5 mm

Skirt26 mm

Skirt height3.0 mm

Finger dimple on top

Grip

Count12

Depth0.6 mm

Pointer — a nose on the side

Size: — · Bore: —

Triangles: — · Est. weight: —

Recommended: Print as exported — bore opening on the bed No supports 4 walls or solid 0.12–0.16 mm layers for the bore

If the first one is tight, warm the shaft end of the knob in hot water for a minute and push it on; if it is loose, print again with the clearance one step lower.