Alarm when preheat completes

[theCADman99]

Someone may have already suggested this, but having an alarm for things like preheating extruders and beds would be great.
An alarm for job finished would also be nice

[TenKOhms]

If your machine has a buzzer on it, such as the LCD screen, there's a command that will play a beep.

M300: Play beep sound
Usage: M300 S<frequency Hz> P<duration ms>
Example: M300 S300 P1000
Play beep sound, use to notify important events like the end of printing. See working example on R2C2 electronics.

I just tested it on my Taz 4 and it beeped at me!

You can add this to the the Starting scripts and ending scripts to give you a notification when it finishes preheating and finishes printing.