A emergency stop button is needed, recently when I was doing a purge the z-axis failed to register that it hit the bed at the start and just drove the whole carriage down into the bed and kept on doing it, there was no way I could stop it, the bed was already hot and and all I could do was to hit the power switch at the back. When turning it back on there was no way I could get the head to move up, the only thing it responded to was the Home button, and when that bed moved with the head planted HARD into the bed I swear to god that was the moment when I was sure that it had seen its last use.
There has to be a Stop button that it instantly obeys, not 1 sec or 1 layer later, the instant you hit everything (but fans) MUST stop in its tracks.
It also needs to obey the movement buttons better, it just sits there and refuses to move anything for some reason.
@bhudson Ah, I thought hitting the power switch was a big “no no” until everything had cooled down. Also good to hear that it cant damage itself too seriously, I got very worried when I heard those motors scream.
@svelo During normal use, it is not good for the print head to shut down the printer while hot. However, in an emergency, the power switch is the E-stop. Just turn the printer back on so that the head can cool normally. A loss of power for 2-3 minutes will not hurt the print head while hot. It is turning off the printer and leaving the print head hot for a long period of time that causes the issue, especially when done as a habit. Once in a while, for instance on a power failure, will probably not cause a problem.