After a lot of beginner problems i found the power supply as a reason for some undefinied errors. In some cases the printer suddendly makes a shutdown. I checked cables GCode Hotend etc but do not find a solution. After finding some Mods in this forum i decided to change the Hotend in the future to a E3DV6 compatible one. First of all i replaced the Thermistor (NTC B3950) and the Heater (24/40W). Checked Temperature and Thermistor with Multimeter (Difference is about 1°-2° /Resistance of the Heater is a little bit lower) and used the original Hexagon. But if i started a print the R2 made everytime a shutdown. Sometimes during heating with Hotend an Bed or after correct heating when the Extruder or Bed begins to move. I checked this with Pre-Heating in Cura Without Bed Heating and a lower Temperature the Print is succesful. So i checked the Voltage of the Power Supply. I think 23,4 V without the R2 is too low. Can someone check the Voltage ? Regards Excuse my School English !