Suggestion: The big button should stop the laser while it’s running in case of an emergency situation. It could glow red while lasering (lasing? laser engagementing.)
The only way I knew to stop the laser it run to the computer and hit cancel (hoping the computer is working properly, didn’t go into a screensaver with a password that the user doesn’t know, LAN and Internet are working okay, etc). Maybe it would stop if I opened the lid, but that seems like a bad idea as I’d still want the fans to continue.