This is a replacement switch part for the internals of a swing-arm desk lamp. While the original plastic knob probably does not fit this design, the originals always fell off and got lost very soon.
Officially, I designed this to replace the failed Bakelite part on this exact lamp by Alvin: https://www.amazon.com/Alvin-G2540-B-Swing-Arm-Ventilated-Spring-balanced/dp/B001DNFLYS/
I printed it in 100% PETG and it's lasted very well for 2 years of daily switching.
Body1.stl | 53.4KB |