I have an E3D v6 on an Ultimaker 2. The electronics on it are the Ultimainboard 2.1.1 and the power supply's output is 24V 9.2A 221W Max.
After having heat fluctuation issues I attempted to fix them with PID Autotuning but the problems remained. I did some searching here in the forum and read on one of the topics that a higher power heat cartridge could solve the problem. So I changed the ~20 Ohm heat cartridge that was running on 24V.
I placed a 4.2