Blueair Blue Pure 311 Air Purifier Filter Cage

This is a replacement filter cage for the Blueair Blue Pure 311 Auto Air Purifier. It's very easy to accidentally throw away the OEM filter cage when discarding an old filter, so I designed this for a friend to replace their lost filter cage.

It prints in two parts, but they don’t need to be glued together; the friction against the filter is enough to hold them in place. I designed the cage to closely mimic the original, although I used circular holes instead of hexagonal to eliminate the need for most support material.