DIY Air Purifier CR BOX - Easy filter changes - Modular design

A Corsi Rosenthal box inspired by the 3d Handyman's Model B design. I like the look of it and it and filters can be changed out in seconds unlike the original CR box which requires duct tape or hot glue. I live in Australia and parts and postage are expensive, which is why I designed this. I would suggest a different fan setup. But this seems to work OK and I'm having fun trying to optimise it.

The design consists of 4 pillars which bolt on to a top and bottom panel to create a cube shape. By changing the size of the horizontal pieces and spacing out the pillars you can use any sized filter you like. The pillar heights can easily be adjusted in the slicer, and you can join multiple pieces together.

This was designed in onshape you are welcome to modify it suit your needs, especially if you decide to print your horizontal pieces rather than use wood or acrylic. 

Notes:

1. Make sure your fan shroud setup is good
2. Cardboard can be used for prototyping or permanently if you like
3. Bottom piece could be thinner, top could be used as bottom to save filament
4. Optional bottom piece has mounting holes for future electronics.
5. Fan grills can be printed using infill pattern as a mesh
6. Can use traditional metal fan grill
7. Holes are 4mm for m4 screws, or use m3 heatset inserts
8. Weather stripping or foam is used to create a better seal, remember to account for it when calculating the pillar height.
9. The pillars can be printed with low infil and rectilinear, you want 3-4 walls though.
10. horizontal pieces were creaking with rectilinear, grid is better
11. My build has added feet (this was because I messed up my base spacing. 

My build

• 4x 120mm Cooler master Sickleflow PWM ARGB fans (connected in parallel (2 wires 12v)
• 4x 3M filtrette Merv 13 12x24x1
• 12V powersupply from old router
• Ducting on exhaust side
• Velocity Stack on the intake (needs further testing)

Later upgrades

• USB Power Delivery, will trigger 12V from a PD capable supply
• Make use of PWM for fan speed
• wifi enabled
• air quality sensor
• RGB to indicate air quality
• Dust Pre filter 

Design Goals

• Economical
• Printable on an Ender 3
• Quick filter changes
• Durable

Will provide tips and better instructions later