This the center of a Happ arcade style button.  This fits the longer (about 35mm threaded portion) Happ buttons. You can customize it with text etc in Prusaslicer, and if desired add a 4mm LED to illuminate the text.  It works well with in PETG with a section printed in white filament to diffuse the light from the LED. Clear works too, but white diffuses better.  You could also use an MMU, or just different layer colors. You can play with the infill settings to adusts the light diffusion. Be carefull routing the LED wires so that they don't interfer with the button action. It prints face down without support.