Yeah, definitely 3D printed.
This is what I came up with.
There's a HEPA in the magic blue box. Closed off all other windows that could act as air intake. Turned on the bathroom and kitchen fans. They take air from the inside and exhaust it outside. We're doing ~600 CFM at the intake pipe. The HEPA is tiny in comparison to what a Corsi-Rosenthal box uses but it's compensated by having a high static pressure fan that can pull much more air through it. If it didn't work I was gonna go to CT to get some filters and a fan. :D
🏭 𖣘
How much should it be? It uses a great sensor, Omron main switches, it's built by two guys in Toronto, Canada where rent isn't cheap. There're definitely cheaper massproduced mice that don't share IP for free. This isn't that.