Jimf wrote:I try not to leave machines unattended but sometimes you need to get another cup of coffee or bathroom break. I put a remote wifi camera in my shop that I can view on my phone.
The room is also equipped with several fire extinguishers and smoke alarms. Now that I have a laser cutter, it is very important to keep a eye on things.
Leaving the room for a minute or two is okay. It's the people who start jobs and go to bed, or the store, etc. that worry me.
I don't even like to run the 3D printer when I'm not home or sleeping. I hear about people running 40 hour prints and just shake my head.
I would not let my Shapeoko go more than briefly unattended either, and certainly never on a first run of a part. There is just no way to adequately monitor whats going on between the bit and your work piece.
Most mid-high level 3D Printers should have enough safety features to prevent a fire, though. There are fewer (and easier) variables to control.
On the machines I use:
*The normal running temperatures are well below flash point if the something mechanical were to fail and the print head would get buried into the part.
*If the thermocouple were to become detached from the extruder head, the low temp warning would trigger and extrusion would stop.
*If the thermocouple were cut, it would read maxtemp and extrusion would stop.
*All wiring is properly rated, and the power supply and control electronics are contained within a metal enclosure.