# Struggeling with PLA - Nozzle temperature off? **URL:** \ **Category:** Snapmaker 2.0 (3-in-1)\ **Created:** [September 8, 2020, 8:13pm UTC](https://forum.snapmaker.com/t/struggeling-with-pla-nozzle-temperature-off/9122 "2020-09-08T20:13:52Z")\ **Posts on this page:** 1\ **Showing post:** 22
**Author:** ![brent113](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.snapmaker.com/brent113/32/11114_2.png) [@brent113](https://forum.snapmaker.com/u/brent113)\ **Post date:** [October 2, 2020, 5:27pm UTC](https://forum.snapmaker.com/t/struggeling-with-pla-nozzle-temperature-off/9122/22 "2020-10-02T17:27:15Z")
I’ll just say I did get it working last night, it works great, and I redid the calculations for transistor loading, PCB trace width ampacity, and cable ampacity. There’s a ton of headroom and like @Hauke said you could put about 10 fans on this circuit and be fine. Which is convenient because I’m thinking about adding a second one. @Franky, thanks for the numbers on the hot end fan, I’m referring to the part cooling fan though, the tiny 2510. I haven’t experienced any issues with the hot end not having sufficient cooling. The control circuit is going to be a pin output from the MCU directly driving the transistor. The transistor output goes directly to the fan ground and switches ground. There is no flyback circuit. To limit how off topic this post got, I moved my measurements into here: > [@3DP Part Cooling Fan 5015 Replacement for Gen 1 extruder](https://forum.snapmaker.com/t/3dp-part-cooling-fan-5015-replacement/10038): > > There is no flyback part cooling fan circuit, the fan is switched directly to ground. There is a resistor used to limit gate current from the MCU to the switching transistor, but is not part of the fan driving circuit… Here’s the steady state information. I think the nameplate rating must be based on either worst case or more of a dynamic startup current. 5015:~90mA 2510: ~30mA, I also measured the inductive kick of both fans, since there’s no clamping circuit. 5015: ~-65V 2510: … --- _[View the full topic](https://forum.snapmaker.com/t/struggeling-with-pla-nozzle-temperature-off/9122)._