This is a basic recirculating activated carbon air filter for use in resin printers. I designed this for use in my Elegoo Saturn, but it should fit inside many other printers as well.

BOM is

• 4020 blower fan, dual ball bearing.
• 3x black oxide m3x20 socket-head screws
• 3x 6x3mm magnets
• 3x m3 heatset inserts
• 4mm activated carbon pellets - about 90g per fill

The magnets should press-fit into the bottom of the tower, use a drop of superglue or similar if they don't fit well.

Install the heatset inserts in the base, and then using the printed spacers, screw the fan to the base. The spacers will lift the screw caps high enough to cling to the magnets when stacked.

The lid should snap-fit into the top of the tower, and hold well enough to keep the pellets inside even turned upside down.