<p>So I just printed my Bullseye mod for my cr-10. But now I have a problem, when my hotend is trying to heat up it can't, because the cooling is to powerful. I know this because when I stop the fan with my finger it starts heating up. Is there any way I can make the fan slow down when printing (because it's not printing properly either) and total stop or go at a minuscule amout when heating up.  </p>

<p>Help is Appreciated</p>

CC BY-SA 4.0
2019-05-26T15:20:00.323Z
Welcome to 3dPrinting.SE! In the slicer you can limit the amount of cooling fan ... even turn it off if you wanted to.
Pᴀᴜʟsᴛᴇʀ2
CC BY-SA 4.0
2019-05-26T18:34:50.713Z
Make sure that the part-cooling fan is connected to a port that can be controlled by G-code. The port intended for the hot-end fan is often (but not always) hard-wired to the power supply.
Mick
CC BY-SA 4.0
2019-05-26T21:22:00.887Z
What is a Bull's-eye mod?
0scar
CC BY-SA 4.0
2019-05-27T03:35:38.667Z
@0scar https://www.thingiverse.com/thing:2759439   Alec do you have it installed too high where it is blowing on the heater block instead of the nozzle? Also what slicer are you using?
T. M.
CC BY-SA 4.0
2019-05-28T11:26:08.077Z
Also, always use a silicone sock on your heater block.
towe
<hotend><creality-cr-10><speed><cooling>
Hotend Will NOT Heat Up with Bullseye
Alec
# Hotend Will NOT Heat Up with Bullseye

(Asked by: username_0 on 2019-05-26)

So I just printed my Bullseye mod for my cr-10. But now I have a problem, when my hotend is trying to heat up it can't, because the cooling is to powerful. I know this because when I stop the fan with my finger it starts heating up. Is there any way I can make the fan slow down when printing (because it's not printing properly either) and total stop or go at a minuscule amout when heating up.

Help is Appreciated

**Tags:** hotend, creality-cr-10, speed, cooling

> **Comments:**
> **username_1**: Welcome to 3dPrinting.SE! In the slicer you can limit the amount of cooling fan ... even turn it off if you wanted to.  
> **username_2**: Make sure that the part-cooling fan is connected to a port that can be controlled by G-code. The port intended for the hot-end fan is often (but not always) hard-wired to the power supply.  
> **username_3**: What is a Bull's-eye mod?  
> **username_4**: @username_3 https://www.thingiverse.com/thing:2759439   username_0 do you have it installed too high where it is blowing on the heater block instead of the nozzle? Also what slicer are you using?  
> **username_5**: Also, always use a silicone sock on your heater block.  

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## 0 answers

