Automatic Cooling for Wanhoe Duplicator 4

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I've been putting the automatic fan upgrade for my Duplicator 4 through its paces and WOW what an improvement in the quality of life around here. I can finally just start a print on my Dup 4 and walk away knowing the active cooling fan will kick in automatically. No more being stuck to the printer. It hooks up in series with my existing fan circuit using hardware that's already there. It's micro adjustable so you can set it to turn on after a certain distance into the print, up to about 5mm or even further if you use a longer M3 bolt in the adjustment mechanism. The fan always turns on at exactly the same distance into the print, not like when I had to do it by hand. I've been giving my printer a real workout lately printing inventory for my web store. I think my prints are coming out better than ever with consistent results. There's a manual override switch just in case I need to go back to full manual control. I always wanted to control my active cooling fan from gcode, but that requires soldering a surface mount MosFET (Q6) onto the Duplicator 4's MightyBoard. I'm pretty good at soldering, but Q6 is a surface mount part and without the proper equipment I wouldn't take the chance of damaging my MightyBoard and voiding my warranty. That would be a real bummer. These boards are in short supply and I can't afford to be down for long. Plus I almost always just turn my active cooling on full after the first layer. I have gcode control on my i3 but never do more than 100% fan after the first layer. That could be done with a micro switch and 3D printed mount. I could use an external wall wart power supply and be totally isolated from my printer's electrical system. Complete assembly instructions can be found here: https://ricswika.wordpress.com/2016/01/24/automatic-cooling-for-wanhoe-duplicator-4/ Hardware Parts (Buy parts kit here) Sub-miniature Micro Switch With Lever Roller (Uxcell PN:s14073100am0209 ) SPDT On/Off/On 3 Position Mini Toggle Switch (Amico PN:s12101100am0009 ) Hex Nut Fastener, M3 Female Coarse Thread Hex Drive Cap Screw, M3x10mm or M3x15mm 3 ½” of heat shrink tubing 3 feet two conductor hook up wire (old speaker wire works just fine)