Replacement knob for D-shaft (6 mm and 4 mm, parametric) + fit test coupon

Not test-printed yet. Print the coupon first.

I made this replacement turning knob for D-shafts, the round shafts with one flat side. It comes in four sizes, plus a small coupon to check your clearance before you print a full knob. All pictures are CAD renders. I'll add photos once I have a test print.

Sizes (shaft Ø / across-flat, in mm)

• gw-knob-d6-f4.6: shaft 6.0, flat 4.6

• gw-knob-d6-f4.5: shaft 6.0, flat 4.5

• gw-knob-d6-f5.0: shaft 6.0, flat 5.0

• gw-knob-d4-f3.0: shaft 4.0, flat 3.0 (small pots only)

How to measure

1. Measure the shaft's round diameter with calipers.

2. 2. Measure across the flat: from the flat face to the opposite round side.

3. 3. Pick the closest size from the list above.

4. 4. Not sure? Print the coupon first. It is sized for the d6-f4.6 shaft and has five D bores at clearance steps of 0.10 / 0.15 / 0.20 / 0.25 / 0.30 mm, marked by 1 to 5 notches on the edge. Try your shaft in each and note which one feels right.

Print settings

• Top face down, no supports.

• PETG recommended (also for the d4-f3.0 size).

• ASA if the knob sits somewhere warm.

Please note

• This is a turning knob. It's not for forcing stuck controls.

• Not for hob or oven knobs, or anything else near heat.

Change the sizes yourself

The CadQuery source (knob.py) is included. Edit the shaft diameter, flat and clearance values to make your own variant.

Want to model your own replacement parts? My Fix It kit: https://whop.com/garsideworks/fix-it-from-a-photo?ref=printables (not for EU/EEA consumers)