Geeetech A20 Mosfet 303010 fan adapter
thingiverse
The Geeetech A20 (at least my version) has an external MOSFET which has a 25x25mm fan on it which hardly moves any air - therefore I decided to go one step further and mount a 30x30x10 fan (USONGSHINE 24V DC 303010). Any other manufacturer fan should work, just take care that it is not higher than 10mm because there is hardly any clearance without modifications. This is a new version I printed because I was unhappy with the first design. I printed with TPU to dampen any fan vibrations, but PETG should also work fine. You will also need some M2.5 Screws for mounting the fan, 12mm is fine for the fan and for the mounting to the heatsink I used 16mm long screws. Make sure to cut the threads for the fan-mounting screws before attaching the fan - the holes are intentionally left narrow.
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