A real, working desk fan: a 775 DC motor spins a printed compressor-style impeller, which pulls air in through the inlet and blows it out of the outlet flange at the top. A PWM controller in the base gives you a speed knob.

• 4 printed parts: housing, impeller, motor holder, base (~0.9 kg PLA/PETG)
• Housing needs ~256 mm build height and tree supports
• Runs on a 12 V / 5 A adapter, so no mains wiring needed
• PETG recommended for the motor holder (the motor gets warm)