3D printed solution to an everyday emergency - a broken knob on the dryer!
I printed it in NinjaTek SemiFlex because that's what was loaded in the printer. A rigid material will work equally good or better. The springs from two of the knobs were still in place, so I pressed them into the knobs. The 3rd knob (for Cycle Signal) was just pressed onto the shaft without the spring. You may or may not use the springs for a rigid material.
Original Inventor file included.