Evaporative Humidifier

Northern winters are exceptionally dry, traditional ultrasonic humidifiers readily contaminate the air, and evaporative humidifiers often cost hundreds of dollars, so I opted to 3D print a humidifier at a mere cost of $40!

The humidifier's water reservoir utilizes a pet waterer; select the 4L model shown in the image, costing $18.

The evaporative filter can be a Philips humidifier filter, costing $5 each (price increased).

A standard household computer cooling fan will suffice, a 9cm square model costing $8.

A 12V power supply with a screw-on DC connector is needed, costing approximately $10 or more; you can repurpose an old router or similar household appliance, provided it has a 12V DC connector.

A speed controller is optional; for quieter nighttime operation, install a speed controller to reduce noise, costing $3.

The print comprises three parts; a flat, circular disc sits between the fan and base, isolating the filter, secured with screws from below.

The filter in the image is slightly smaller due to prior washing; a new filter fits perfectly into the base.

Evaporation rate: At full power for 24 hours, it consumes approximately 4L (one reservoir) per day, sufficient for a small bedroom; tests in a student dormitory increased humidity from 30% to 60-70%.

A compiled shopping list is available in the comments section.