I incorporated user cerberus333's excellent model of the foot that squashes the title in the Monty Python show opener, into a custom knob for a J38 style straight key. After printing, I gave it a couple of coats of spray on satin finish clear poly urethane paint. Prints well without supports, and looks great at 0.08mm layer height.

NOTE: I added a left foot version for those QLF guys. ;-)