About a year ago, purchased an e3d V6 for my folgertech i3 2020 printer. I just recently started trying to print with PETG with 240 degree nozzle temps. All of my previous PLA prints were with 200-210 degree hot end temps. Now that I'm trying to reach higher temps, I've been fighting with thermal runaways. After debugging, I believe it could be that the heater cartridge can't keep up with the part cooling fan. With the fan on at 100%, the heater block won't reach 240C. In the firmware, I have full power going to the hot end, so it's not an issue with limiting max power in the firmware. I can get successful PID autotune with 50% fan speed, but when the fan kicks on when actually printing, I get thermal runaways regularly. If I remove the silicone sock, my hot end can't reach 240 at all with the fan on. I'm running a 12V system, and I suspect the stock 30W heater might not be able to overcome the blower fan for part cooling. I've ordered the 40W 12V heater cartridge to swap out, but I wanted to know if there could be anything else going on. It seems strange that the stock setup out of the box wouldn't be able to overcome the part cooling fan. Any suggestions?