Problem is when they have totally different power ratings, temperatures could differ by a lot. i would rather have each one on its own control circuit, i.e. 2 MOSFETs and 2 thermistors.by Hfleming - Reprappers
Same here, went back to bilinear instead of UBL. Will try it again once there is a " UBL for dummies"by Hfleming - Firmware - Marlin
What are your speed settings in Marlin?by Hfleming - Printing
Got my P3steel from Orballo today, just a week after ordering. so far I have assembled it as far as I can, without any problems. Frame seems very sturdy. Now I just have to fire my Mendel up again and print all the vitamens and other goodies. I am thinking about having an easily-changeable X-cariage, so that I can swap easily between hot-ends and different tool-ends, like a laser-engraver or a Drby Hfleming - Prusa i3 and variants
A couple of observations. At a 5V gate voltage, you are dissipating roughly 3.5W in each MOSFET. If you use a totem-pole circuit to drive them (2 transistors) and maybe a third one to invert the input, so you have 12 V on the gates, you will dissipate 2.7W in each MOSFET. That will help a bit with the heat, but I would add a 12-20V zener diode and a resistor between the gate of the MOSFETs and gby Hfleming - Controllers