based on Dual- Non Titan Direct Drive Bowden system I have had a problem heating up the extruders to 285 for tightening the HotEnds. Once the temp reaches 250 the LCD displays "Heating Failed". I have changed the max temp to 300, and saved it but still resulted in the same shut down "Heat failure". It continues to change back to the default of 250. I have purchased the Carbon Fibre filament which requires a hotter temp, 230 to 250 degrees, but while testing its estep/mm with different temp's around 230 to 245 degrees, the printer would again shut down on the Heat failure. I had read that the PT-100 were to be able to cope with these higher temps.