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) ?

  • 1
    $\begingroup$ Try to measure the resistance - does it have the expected 3-4 Ohms for a 40W 12V cartridge? $\endgroup$ – towe May 27 '20 at 12:15
  • $\begingroup$ It might be the wrong cartridge $\endgroup$ – user77232 May 27 '20 at 12:24

If it is 40 W then it shouldn't matter what length it is. Note that the heater cartridge just contains a Nickel-Chrome wire-resistor (see image below for the construction), this resistor gives its heat to the metallic shell, the length of that shell shouldn't matter, it usually contains heat free/colder zones at the tip and root. Even if it is a 30 W heater cartridge it should be able to get to temperature, it would just take longer.

If it is a 24 V, 40 W cartridge, operating at 12 V, then the effective power would be $40[V] \times \frac{12[V]^2}{24[V]^2}=10 [W]$. This might be too low to reach the temperature. It is best to check the resistance of the heater element with a multitester; it should be about 4 Ω for a 12 V heater cartridge and about 14 Ω for a 24 V heater cartridge.

enter image description here


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.