3D printers aren't the fire hazards of yore. They're quite reliable, fused, with multiple interlocks for various conditions (mainly around heating not matching expected rate) that will kill power.
The main potential problem these days (in my view) is whether a print finishes without crashing or delaminating from the print plate, which also has workarounds... but that's only potential printer damage, not a fire.
The main potential problem these days (in my view) is whether a print finishes without crashing or delaminating from the print plate, which also has workarounds... but that's only potential printer damage, not a fire.