LunchBox HEPA+Carbon filter for Prusa Enclosure/Bambu Lab X1C/P1P/Voron/Qidi (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