In general a modern 3D Printer is safer then a hair curler or a toaster in terms of fire safety matterhackers.com has a how a fff 3DPrinter works
Anything else your welcome to bring it up
Reference
This looks amazing.
A fused filament fabrication (FFF) printer works in the following ways
A heated nozzle
_ejects molten plastic, depositing it in thin layers, one on top of another
_onto a print bed
_eventually forming the 3D printed part.