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cjdavies

Raspberry Pi 3B case with 40mm fan to fit Kintaro heatsink

by cjdavies Aug 14, 2018
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You might want to look at adding a small capacitor between the fan and the GPIO, with a small switch between the Cap and the fan. This would prevent the need to push start it.
Basically, the motor is likely rated for the 5V, but has a starting current in excess of what the GPIO pins are capable of producing (20mA if memory serves). Now that I think about it, you might be able to get away with simply splicing the input power into two and connecting to 2 separate GPIO power pins (assuming you have others not in use). Then you could draw twice the current (power) without having to do much in terms of wiring.
I like the concept though.

No need for a capacitor. Never had to push the fan.