USB-C Powered PWM Fan Controller for PC Fans

A compact PC Fan variable speed controller powered by any USB-C PD input.  Useful for testing PC fans, running a desk fan, or an inexpensive power solution for the Noctua NC-FS1 desk fan.  Works with any 3 or 4 pin computer fan and provides granular PWM speed control via the knob.

No supports needed.  Design includes allowances for cable routing and solder joints.

Features:

• USB-C Power Delivery input
• 12V PWM controlled output to 3 or 4 pin PC fans
• LED power indicator (red when on)
• Lid secures both PCBs in place when attached
• Can power multiple fans via splitter cable (controller supports 3A max power output)
• UPDATE: Added a base version that does not need heatsets.  Screws thread directly into plastic
• UPDATE: Added a lid version for button or socket head screws instead.  Screw holes will need supports to print.

BOM:

• 2X M3x6mm flat head screws
• 2X M3 heat set insert (M3x5x4mm Voron spec)
• 1X DC12V Manual Four-Wire PWM Fan Speed Motor Controller Board With Knob Switch ( https://www.aliexpress.us/item/3256804358897430.html )
• 1X 12V Type-C PD decoy module ( https://www.aliexpress.us/item/3256804070825333.html ) 

     Total cost of around $4

Assembly: (5-10 minutes)

• Remove the knob, nut, and washer from the controller PCB.
• Solder the two PCBs together outside of the case (leave ~1.5” of wire between them).  On the USB PCB, stick the wire down through the holes and solder from what would be the underside of the board.
• Add the 2 heat sets to the case.
• Stick everything into the case.  PCB's should fit snugly in place.
• Reattach the knob.  Washer first, then nut, then press on the knob.
• Attach the lid with the two M3 screws.