I then placed the components on my stepper mounted connector board and wired them in. Pict below:
The following short video best shows fan speed control being tested.
The true benefit will come when I enable Auto Cooling within Slicer and the commands to switch on/off, and change cooling percentages are applied to the sliced gcode and called on during the print job. Slic3r now contains such settings... see screenshot below:
Other controller boards may also provide PWM Pin Output, and this simple two component addition to the fan wiring gives great control of print cooling when combined with the Slic3r Auto-Cooling features.
Hope you found it of interest.
Thanks for viewing!