My mother's Kenmore range had a knob that broke years ago and she hasn't been able to find a replacement (at a reasonable price, anyway). I was able to create this in Solid Edge fairly easily. It's not perfect, but it's functional. Ideally, I'd 1) tighten up the tolerances on the connection, 2) shorten the tube connector a bit, and 3) round off the bottom edge of the outer brim. Neither hurt the functionality, though, so I'll update it when it fails. 

I printed this using Elegoo PLA. Printed using tree supports with the connector face down. This was done to keep the visible face clean. The tree supports peeled right off (most staying on the build plate), leaving a clean print. 

I've included a STEP file if you wish to tweak the knob for your own use.