This toolhead cover allows to install a 5015 fan on Creality K1/K1 Max, greatly reducing noise and vibrations compared to a stock fan.
Personally I use Sunon MagLev MF5015VX-1L01C-S99 DC 24v 4-pins fan.
You will need JST 1.25 4pin connector and a couple of heat inserts.
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The author remixed this model.
Simplified printing, made cosmetic changes, made several other changes specifically for 5015 fan.