"I am running Klipper on a BTT SKR1.4 Turbo, and I am unable to get my mosquito magnum to reach and maintain temperature. The heater cartridge as well as the thermocouple are both installed using the boron nitride thermal paste, and the heater is powered through a solid state relay which is connected to a 12VDC - 30Amp power supply via 10AWG wiring. I also verified that the heater cartridge that I ordered is 12VDC as it should be.
I have attached a picture of the installation of the hot end as well as a documented chart from octopi. In the picture, you will see that the part cooling fan blows just below the nozzle, but even though it is only a 40x10 fan, and doesn't blow directly on the block, I cannot maintain a temperature over 250C while running the fan at 100%. Even at 250C, it can barely do it without feeding any filament (See attached chart).
My first thought was that the power supply wasn't able to keep up, however there were no differences in the performance whether I was running only the hot end by itself, or when I had motors powered on and also with the heat bed set to 70C at the same time. During prints at 100mm/sec, the filament running through the hot end is also enough for the temperature to start dropping without a fan at 275-285C. Measuring voltage on the power supply while trying to heat up the hot end shows a solid 12VDC.
Since I first ordered and installed my mosquito, I have been printing successfully up until the last week when I got my part cooling fan installed. I did notice that I was starting to have problems printing at higher speeds after making some other modifications to my printer that allowed me to start printing more than 100mm/sec, but I was limited mostly by the part cooling, now that I am trying to use the part cooling fan, I can't print at all because it seems like the heater cartridge just heat the block very well.
Thank you in advance for your help with this matter."