# Prusaslicer question about fan speed in skin surface on top of infill

**URL:** <https://forum.snapmaker.com/t/prusaslicer-question-about-fan-speed-in-skin-surface-on-top-of-infill/32858>\
**Category:** Showcase & Prints\
**Created:** [September 12, 2023, 12:56am UTC](https://forum.snapmaker.com/t/prusaslicer-question-about-fan-speed-in-skin-surface-on-top-of-infill/32858 "2023-09-12T00:56:34Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Rwide](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.snapmaker.com/rwide/32/27055_2.png) [@Rwide](https://forum.snapmaker.com/u/Rwide)\
**Post date:** [September 12, 2023, 12:56am UTC](https://forum.snapmaker.com/t/prusaslicer-question-about-fan-speed-in-skin-surface-on-top-of-infill/32858/1 "2023-09-12T00:56:34Z")

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I just realiced that Prusaslicer runs my part cooling fans at 100% instead of my default (50%) when printing surface on top of infill. Rather than testing my way forward, I thaught i might aswell ask because it might be quicker..

How can I turn this off? Must i disable the dynamic cooling or adjust the fan speed for 0% overlap (bridge). It is currently set to 100.. Hopefully there is a better way?

In a perfect world I would be able to keep the fan speed for 0% overlaps at 100%, so my supports detach easy but i absolutely do not want the fan speed at 100% while printing top surfaces..

Can it really be that bad that Prusaslicer considers surface on top of infil to be a bridge? 😢