Ender 3 Emergency Stop

thingiverse

<p>This is a simple 2020 extrusion mount for an emergency stop button. I wanted something that would immediately cut motor power in case something got stuck for example. While other methods such as a button to cut printer power was an option I didn't like the fact that the fans would also be stopped. This can lead to clogs due to heat creep. My solution was a software one, hooking into Marlin to Kill the printer but keep the fans running.</p> <p>This can be done by defining a <b>'KILL_PIN'</b> in the Marlin firmware and your board's pins file.</p> This is an example of the pin I used on the SKR v1.3 mainboard. I used the X-MAX end-stop pin as it was unused. <img src="https://i.imgur.com/bAsPrpO.png" /> If your button is reversed, i.e. is triggering when not pressed, then you can reverse the pin trigger state in the MarlinCore.h file. Change LOW to HIGH: <img src="https://i.imgur.com/NDa88fn.png" /> The button I used can be bought here: https://www.aliexpress.com/item/32800114918.html I've also included a contacts cover for the button to prevent debris from triggering the KILL state. Hopefully this is useful to someone. :)