I wasn't satisfied with any of the models I found for clean/dirty dishwasher indicators, so I decided to practice some modeling and make my own. My wife hates the feel and sound of 3d print material sliding together, so I used a low-friction slider to reveal the correct state.

Slider snaps over the top of body after printing. Magnet holes fit for 15 x 3mm, I glued the magnets in slightly proud for best adhesion.
 

This is the first published version, follows alpha v1 that had .01 tighter tolerances, only 2 magnets, and deeper/smaller letter holes.p