Replacement part for a State ProLine gas water heater control valve knob.
Compare the crack in my original knob to the crack in aclymer's knob. You would think they are the same part. That looks like a bad design to me. Well, it was cracked before I touched it. No, really. My knock-off didn't crack. Booyah!
I marked this design as a remix to give credit to two similar designs that I consulted for inspiration. However, I did lay it out from scratch in Fusion 360.
I printed this upside-down with support offset by 0.5 mm from the part.
Use this design at your own risk. Read the instructions, twice. Not responsible if you turn on the gas and blow up your neighborhood. Consult a professional before you proceed. We don't need no stinkin' lawsuits. Thank you.