I had to take apart my extruder due to a filament jam.
I forgot which direction the side fan of the extruder was facing? Sticker side up, or sticker side down?
I have the Snapmaker original.
Thanks
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The Fan blows on the heatsink.
This means, it blows into the module.
Hope this helps.
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If the extruder is connected, the fan will start spinning as soon as you turn the unit on. So flip it on, see which way it blows, then turn it off.
I had the same issue. I also didn’t turn the unit off while I screwed the fan on, and I broke several fan blades when the screwdriver slipped. 
Yes. Thank you very much
Hi,
I have the same (and more) problem: which side of the heatsink fan does it have to show?
I broke 2 blades in the same exact way, screwdriver slipped while on.
Now both fans do not work and when I go to change filament, the LCD screen shows target+current temperature but shuts down after a while and freezes.
I have a Snapmaker original.
Any suggestions?
To answer Tagz7781, I think the fan goes sticker side you as you mount it.