For more Information, please check this video:
Complete Project documentary:
if someone doesn't know the extruder yet, that's actually quite easy, we always have VCC requests about a magnetic ball and here we have the GROUND request from the hotend. Here we have the GROUND from the fan. So we are able to control the fan via PWM as well as the hotend. To measure the temperature now, we have this small circuit board, where the golden pogo pins are attached. As soon as this part is pulled into the magnet holders, they also have contact. Why all this? Now you see for yourselves, it is very compact. There are no wires flying through the area and so all my HEADER will be.