Simple Wedgewood Gas Stove Knob

A friend needed a functional replacement knob for his old Wedgewood gas stove and they were hard to find and expensive, so we made a simple design for a replacement. The design was done in OpenSCAD, a simple free CAD program for designing STL files, and the design file is included here. It's easy enough to adjust for sizing. The design is simple and well commented. There are some other knob variants in the design file. 

We used PLA and did the design via email since it was January 2021. He had a caliper so was able to make good measurements, and I made shaft sizes at 0.2mm increments, but the best fit was the nominal size. We mailed him the parts. I did find one photo of an early test prototype on his stove. It was all done remotely. :)

This was printed in PLA on a Prusa MK3. PETG or ABS would probably be a better choice. ABS might require some adjustment for shrinkage and an enclosed printer. Default slicer settings were used, you can add more perimeters for more strength if desired. The knob area of the stove doesn't get hot so PLA was adequate.

Best print orientation is with the shaft part down, flipped over from the CAD orientation. Supports are required but this way they are under the knob and any support related surface damage won't be very visible.