[Feature request] Audio alert when finished

[r3dsk1n]

I like your build, for some reason im getting much better prints with this firmware. I've complied my own but my ender3 with the silent board upgrade works better with this one.
But anyways is there a way to trigger some kind of alert when the print is done?

[r3dsk1n]

I also upgraded to a 20w laser, but I used the 24v pwm signal and fed it into an optocoupler with a 7805 and forced it into saturation. I got the idea from another guy somewhere. But I just used a run of the mill 4 pin optocoupler from a wall wart And pumped 12v into the voltage regulator and also the laser... but yeah for some reason all of my 3d prints have come our beautiful with this firmware compared to mine and a bunch of others.

[Echo7394]

I've noticed a major improvement with prints as well as a reduction in stepper motor heat. It's due I believe to the higher frequency PWM signal. As for an audible beep you can add some gcode such as:

M300 S440 P200
M300 S660 P250
M300 S880 P300

To the "End Gcode" of your slicer to have a series of audible beeps at the end of your print.