I got my BB Dual online last Friday and have been having a good time printing and experimenting with filament. I got a nice clean print of Benchy using the gcode on the included SD card with the white PLA that came with the kit. I swapped over to some ABS that I've had great luck with on a Polyprinter but encountered some serious curling of the parts. I swapped back to the white PLA and last night printed a couple of things I pulled from Thingiverse that I've never been able to get to work correctly on my Thing-o-matic. Both of the pieces printed out very nicely. I was quite happy with the results. On the way home from work tonight I picked up some glow-in-the-dark PLA and tested it against the SD card Benchy that worked so well with the white PLA. After 3 thermal runaways I thought it was the new filament so I loaded in the grey PLA that came with my kit (used up all the white having a good time the previous 3 days). I've now had 3 more thermal runaways with the grey and I'm noticing that it appears to be related to the fans kicking past 80%. The printer seems to be unable to keep the temperature within the range it needs to be. The only thing different is last night it worked and now it doesn't and I'm using grey (or earlier the glow-in-the-dark) rather than white PLA. I've read what I could find regarding loose PT100 sensor, heater cartridge, etc and have checked everything I can find in the forums regarding causes for the thermal runaway and yet nothing seems to work. I just don't understand why it worked so well Saturday, Sunday and Monday only to start failing today. Anyone encountered this and if you did and got it dealt with what did it turn out to be? Note for any other newbies. From what I was able to dig out "thermal runaway" is a feature that kicks in to protect the printer from damage if the power to the heater stays at 100% for too long. Since the fan is cooling my printhead below setpoint and the printer is trying desperately to bring it to temperature I guess the assumption is that the thermal sensor isn't reading right so it's going into a runaway condition. If this is incorrect would someone please clarify as I had to go to a completely different site to find any information on what it was and this was my interpretation of what was said.