How about keeping a fire extinguisher next to the roaster? You’ve already got the power handled and are keeping it clean, which is great. If you stay near your roaster while roasting (as recommended), that should be plenty of safety. These units don’t use gas like roasters that Rao and others use either, so just like any other heating appliance or grill etc, your presence and an easily accessible fire extinguisher should provide the necessary protection, thus peace of mind.
Activate the emergency power button, which is different from the switch that turns the Bullet on or off.
Activate an alarm with another button that is right next to it, so that my family evacuates in a preventive way.
Open the windows and spread ABC fire extinguisher on the Bullet.
I have more than clear that I prefer to lose the Bullet that the whole house of that somebody can end up injured.
But I want another backup plan, because I’m expecting to get a second Bullet and roast with both at the time, I will be cautious and close, but there may be fire that goes unnoticed by being focused on the other machine, in case something doesn’t go right and for that I’m considering the water hard plumbing (to avoid accidents it will be next to the emergency switches and it is a stopcock, not a button).
I like automation, and I am thinking of making an electric exit door that can dump the coffee when the profile ends in Artisan and maybe another automatic door that loads the next batch when the preheat is ready (I’m still thinking how to do it). To that system I would like to add the alarms that Rao speaks in case of overheating in the chaff collector.
I could never tell anyone they’re being too cautious, but again, if you stay near your roaster(s) when operating it, with a fire extinguisher (and blanket as @Damon has done), I think you’ll have more than enough early warning signs to handle a situation, should it arise. My roaster is in my laundry room, which has two doors, one to the outside and one interior, so in my case, I feel pretty isolated. Further, my Bullet is on an NSF stainless steel cart with heavy casters, I could push out the exterior door from that room fast, should that ever be necessary.