I have ZERO electrical and soldering skills. Zero.
So what I did was purchase a 12v power supply, a four-way 3 pin connector (3 pin extension if needed), and a few fans off Amazon. As far as cooling goes, this made it very easy to upgrade my hot end, cool motors and my board, as well as a nozzle fan when needed. That way, I didn't have to solder, and it left multiple options open.
However, there is no option for gcode fan control using this method.
The Printrboard does have a spot to tap into for 12v for gcode controlled cooling. It will be in an area between the connectors: F-L_FAN_B-T. Solder a connector to that. Look into Mods/Hacks section of Soliforum. A SD4 user recently added a gcode controlled fan from his REV E. All newer Solidoodles have the same board.
Printit Mason and Printit Horizon printers
Multiple SD2s- Bulldog XL, E3D v5/v6/Lite6, Volcano, Hobb Goblin, Titan, .9 motor, Lawsy carriages, direct Y drive, fishing line...the list goes on
Filawinder and Filastruder #1870.....worth every penny!