EvaCooler

Description:
This modular design allows you to turn almost any small container or box into a functional evaporative cooler using just water and airflow. By drawing air through a wet medium, it leverages the evaporative cooling effect to lower the air temperature as it exits—making it ideal for cooling small personal spaces.

The fan assembly is built to house two 5V 4010 cooling fans and a Micro USB breakout board, allowing for simple USB power input. Assembly is quick and straightforward, requiring just one M4×16 screw and a glue gun (or any adhesive you prefer).

To prepare your chosen box, I recommend reprinting and stop the print on the second layer of the fan_base part. This creates a physical template that you can use to accurately mark and cut the opening on the top of the box for proper alignment.

The included air duct directs the cooled air outward. To enhance performance, you can add an ultrasonic mist maker, which introduces fine water vapor into the airflow for even better cooling like what I'm using here. You can also place a sponge inside to increase the evaporation surface area—especially useful if the mist maker is not available.

⚠ Note: This cooler works best in well-ventilated areas, as enclosed spaces may see a rise in relative humidity (RH), reducing cooling efficiency over time.

All components have been tested with PLA filament.