I wanted to print something using NGen_FLEX (usually called “Ninjaflex”) rubber filament on my 8-foot-tall Cerberus 3D Gigante printer when I got a “Runaway temperature warning” (right), and the printer shut down.
I checked the graph in Simplify 3D, the combination host and slicer program I was using, and saw the temperature spiking instead of its usual gradual climb.
I shut off the 3D printer, let it cool, and tried it again. Same problem.
I printed the same file with regular PLA and had no problem.
There was only one thing to do …