Hi All, I have been using my BB Dual 1.0 for a while now, mainly using PLA at a temp of between 190 and 200. I have just started printing in ColorFabb XT and so am using a temp of between 240 and 245, however I hit a problem today where the LCD screen just says Heating..... I was using the start up scripts that had the following line: ;heat extruder 0 T0 ; select extruder 0 M109 S[extruder0_temperature] ; set extruder 0 temperature and wait It looks as though the nozzle temperature is never stabilizing, the bed I have set to 65 and it hardly moved from that, however the nozzle is set to 245 yet bounces between 242 and 250. I am using Alex RC6 build and wondered if I should be using different PID values (i.e. tuning them) or if something could possibly have come loose (thermistor etc.) to cause this problem. My current fix is to comment out the above code from the startup script and manually wait for the temperature and then print.