A20M Dual Fan

thingiverse

Alrighty then, I'm going to start with a disclaimer: this setup takes some work, so be aware that you'll need basic knowledge of soldering and be tech-savvy. It's not the easiest setup, but if you're comfortable doing that, I think the payoff is worth it - it's a pretty sweet fan setup. There are two different setups to choose from: a 25MM and a 30MM. Both install the same way; just pick your size. The 25MM setup will get the job done, but if you want something smaller and lighter, it works okay at about 80-100%. On the other hand, the 30MM setup works great with plenty of power - I usually run between 50-70% and my 30MM fans seem to run smoother. However, it might just be that the 25MM fans were pretty cheap, so you might find something better. Setup: I used two 12V fans in series instead of 24V fans with this design because I already had some 25MM 12V fans lying around, and I decided to go for 30MM as well. It seems way easier to get 12V than 24V fans, so that's what I did. You can definitely use two 24V fans in parallel if you want, but I opted for dual 12V fans in series instead - just refer to the pictures; it should be enough information. I already had some connectors from RC hobbies and a capacitor from some electronics I stripped out, so you might need to make a trip to the hobby shop or come up with a similar setup. The capacitor helps smooth out the fans and makes startup easier (pay attention to the polarity). If you do use two 24V fans in parallel, that's probably not needed, but it won't hurt anything. Also very important: I used a Neoprene washer to insulate the extruder from the arms - get one from ACE for a few bucks; I think it was 2.5"X1/8. The burn point is around 260 degrees, and it works well otherwise you'll definitely melt the arms. When you first try it out, if your fans or one of them doesn't spin, just reverse the polarity on one or both - it won't hurt anything if they're reversed; they just won't spin. Test it before you button everything up.