50/30 Monoprice Mini V2 fan (50mm Hotend, 30mm parts)
thingiverse
This device is a bit cumbersome but performs admirably. I opted to employ a 50mm fan for the hotend heatsink on my Monoprice Mini Select V2. The parts fan only serves to cool PLA, so there's a small compartment on the side where you can install a standard 1mmx0.5mm single-pole slider switch. A tiny cylinder on the side of the 50mm fan mount houses a small capacitor (if your fan, like mine, resists PWM input, the capacitor smooths out the signal to plain DC).
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