I want to test printing with more heat and now where I have the phase-fired intensity controller I can test removing the resistor plate and replacing it with a circuit breaker and a contactor, which should trigger the filament runout function if the breaker trips.

If that happens, you would be able to fix what caused the tripping and continue printing after that. The rating of the circuit breaker would depend on the current the 50mm² cable and transformer can handle without getting too warm. Getting rid of the resistor plate would also reduce cost and simplify the build of the printer.

I tested it out and yes, I would say it is helpful for improving print quality. With more power the printed part fuses better together and I noticed some Interesting behavior.

I tested shorting the work current by driving the nozzle on the buildplate to see whether the breaker trips, but with a 10A breaker the copper nozzle melted a bit when I tried to increase the intensity to max level. So the circuit lost contact everytime befor the 10A breaker could trip. Will continue testing with a 6A breaker. With higher power while printing there is also more arcing.

I noticed that like on FDM printing the junction in the layer itself was stronger than the junction between the layers.

Added a C4 circuit breaker for protection. The breaker trips before anything overheats, so it should be a good choice.

B16 for the whole printer

C4 for the work current

Contactor for triggering filament runout function if the breaker trips.

(Just ordered one from ABB for more uniform looking)