In 2020 Tefal Pressing Compact knob broke off and I build a replacement. It was originally posted on Thingiverse and printed with a Ender 3.  I designed this knob with to fit the pressurevalve of the Tefal and I've used it happily after that.

Original upload link:  https://www.thingiverse.com/thing:4149734

I printed it with PLA, but it's best printed with a more temperature safe material like ABS.