This thing is a simple panic button for the Wanhao Duplicator i3 and other rebrands. I own the Monoprice Maker Select v2.1 so your fitment may vary.

It's very helpful for stopping a botched print without having to find something small and pokey to press the recessed microswitch in the panel, or doing a hard shut down with the main power switch at the back of the printer. It does NOT however stop "home all" or other manual head movements. (on my printer at least)

The "PANIC!" and border are raised and colored with a permanent marker. Perhaps a multihead printer could make those print separate colors from the background.

The cylinder shaped actuator is printed next to the button to attach later. I heated the end and stuck it on off center so that the button was more centered on the control panel because the hole on the panel isn't centered. The button is held on with a loop of gaffers tape. If anyone wants to remix it to have a hinge or something, that'd be awesome to see.

Demensions: The button is 25mm across, 4mm deep with lettering and border 1mm high, post diameter is 4mm and 10mm long. Enjoy!