DjDemonD good to know you can run a 12V heater at 24V. It makes sense. A typical 12V PCB heater is 12v^2 x 1.2 ohms = 173 watts. At 24V, 24v^2 x 1.2 ohms = 691 watts. As long as the copper traces and the PSU can handle it, why not?

I always use a 12V hot end heater on 24V. It heats up wonderfully fast!

Hi, really cool development here. I'm just wondering, can the circuit board go at the heat break, so that the hot end and the cold end are on either sides of the circuit board? This would bring the nozzle closer to the effector plane and also help prevent the cold end cooling fan from cooling the hot end.