LunchBox HEPA+Carbon filter for Bambu Lab X1C/P1P (simple recirculating parametric air purifier)

I designed this air scrubber to use a minimum of special parts. Build it today, no magnets, brass inserts, or high performance fans required! Read here about why you should have an air scrubber: https://github.com/nevermore3d/Nevermore_Micro#about-the-nevermore-micro Why pick this model: • Massive filter volume, 2-3x more than the competition • If you have a PC case fan and access to Home Depot you can build this model today • Large filters and novel airflow path reduce static pressure and enable the use of PC case fans • 124x60mm footprint fits inside a Bambu, Prusa, or Voron enclosure • Prints on a single build plate • Doesn't require heat set inserts or exotic hardware • Fusion360 CAD files are available, remixes welcomed Supported HEPA filters: • Preferred: • 86880/MC-V194H vacuum filter • Use "filter_caddy_110x74x21.stl” • Preferred due to high surface area and integrated gasket • https://www.amazon.com/gp/product/B07RM31JCH/ • Backup: • 8040 vacuum filters • Use "filter_caddy_82x41x14.stl” • https://www.amazon.com/gp/product/B0782T7L6P/ • Home Depot alternative: • Any furnace filter, cut to size and mounted in a printed frame • Use “furnace_filter.stl” with "filter_caddy_110x74x21.stl” • Upgrade to a vacuum filter later Supported fans: • Preferred: • 3x 40x28mm axial server fans • Use “axial_fan_caddy_40x28.stl” • Preferred due to high static pressure and reliable quality • These are available cheap on the used market from decommissioned servers • Search on Amazon for “4028 fan” and find a 10 pack with reviews complaining that they're dusty and have the wrong labels • https://www.amazon.com/s?k=4028+fan • 40x20mm fans will fit but I’m less confident about quality • Backup: • 2x 5015 blower fans • Use “blower_caddy_52x15.stl” and “blower_duct_52x15.stl” • https://www.amazon.com/GDSTIME-Brushless-Bearing-Cooling-Extruder/dp/B0B1V6JTB8 • Alternatives that you might already have in a drawer somewhere • 1x 120mm or 92mm PC fan • Use “axial_fan_caddy_120x25.stl” or “axial_fan_caddy_92x25.stl” • Upgrade to a server fan later Activated carbon (optional): • https://github.com/nevermore3d/Nevermore_Micro#nevermore-3d-printer-carbon Print settings: • This is a big model, one wall and 5% cubic infill will print faster Filament: • I prototyped in PLA, you may want to use PETG or ABS if printing high temperature materials Wiring: • Drill a hole in the wall or floor of the enclosure • Install wires • todo: add instructions for normal people Airflow measurements • todo: measure volumetric flow and compare fan and filter configurations   Change log • 2023-08-21 • Initial release • 2023-08-22 • Added clearance for wiring to the 5015 blower parts • 2023-08-24 • Added an all-in-one .3mf file • Added CAD files • 2023-08-25 • Added guidance on filament selection How to contribute: • Post your make, it keeps me motivated to improve the model when I see people using it! I'm especially curious to see how this fits in a Prusa or Qidi enclosure • Post your feedback, idea or remix in the comments! • Post a wiring tutorial! Credits: • The Nevermore folks for the original recirculating air filter for Voron • @thrutheframe for creating the BentoBox for Bambu printers