Desktop fan (120 mm / 140 mm), USB or AC powered desk fan

thingiverse

Mini desktop fan powered by USB boost converter cable or AC adapter. Use a 120 or 140 mm PC case fan. I highly recommend using a 140 mm fan with air flow not less than 120 m³/h (70 CFM). Choose from three fan variants: 1) 120 x 25 mm, 2) 140 x 25 mm, or 3) 140 x 27 mm. Select from three case options: 1) barrel jack + switch + power LED + PWM LED + PWM regulator, 2) barrel jack + switch + PWM regulator, or 3) no additional electronics. All parts (except the case bottom plate) are assembled with glue. Build a full-featured variant using these components: 1. 1803BW PWM controller - available on Aliexpress, eBay, and other online marketplaces; 2. 5.5 x 2.1 barrel jack - XKB Enterprise DC-022B or similar; 3. KCD1-101 (SMRS-101) switch; 4. L-424GDT (or similar 3 mm) green LED + 510 Ohm resistor; 5. L-424IDT (or similar 3 mm) red LED + 560 Ohm resistor; 6. DIN 933 M4 x 30 mm screw + DIN 934 M4 nut; 7. DIN 7981 M2.9 x 6.5 mm screws (four pieces) for the controller board; 8. DIN 7981 M2.9 x 9.5 mm screws (four pieces) + DIN 125 washers (four pieces) for the case bottom plate; 9. Some wires (about thirty centimeters in length); 10. Your preferred glue for plastic; 11. AC/DC adapter or USB boost converter cable (5V to 12V). A boost converter looks like this: https://www.adafruit.com/products/2778 - you can also find it on Aliexpress, eBay, and other online marketplaces; 12. Ten 2 mm silicon rubber pads (optional). Have fun building your mini desktop fan and share your creations!