Recently I had an issue with my heating cartridge, and I decided to change it.
For my Anet A8, I needed a 12 V 40 W one. I ordered it but I received a 15 mm length instead of 20 mm length heater element, but as the characteristics where the same I thought that it should not be an issue!
When I finally tried it, it was not able to reach the commanded temperature. It's like 175 °C instead of 195 °C.
I don't understand why it's harder for the newer heating cartridge to reach the commanded temperature, is the length important even if it's the same power (12 V and 40 W) ?