Ultimate 3D Printer Enclosure Filter V2.1

Updated to version 2.1.  I've made additional updates to continue to improve flow.  I found finer particles of charcoal block the inlet to the fan and decrease flow as the charcoal settles.  I have added a new filter mesh that sits higher in the lower section of the carbon filter housing, increasing the cross sectional area of the charcoal filter by 3x.  I've only printed one copy of this version for myself, so please let me know if you have any issues.  This change only affects the lower filter housing and is backwards compatible.

Here is the change to the assembly:

Depending on your printer's tolerances and the material you print the filter in, you may need to shrink the clips slightly by scaling them in the XY plane.  For some people they have not been stiff enough or tight enough.  

I also recommend printing the upper half the the housing in the thick wall 1.2mm version using supports.  Really well calibrated printers can print the thinner wall but may not work for everyone.

Basically better than V1 in every way.  High flow 120mm blower/centrifugal style fan, HEPA filter, Activated Charcoal filter, tool-less servicing, negative pressure, and easy to 3d print and build. 

Drilling Guide:

Note: Holes are 2.5" or ~62mm in diameter, can be cut with hole saw or jig saw.

Print Settings:

• 0.4mm nozzle, much of the housing is just 2 walls thick (0.8mm)
• 0.25mm layer height worked well for my printer.
• Depending on settings it's about 700g of filament. 
• For most enclosures under 60C (140F), PETG works well
• For actively heated enclosures, I recommend Nylon/ASA/ABS
• Supports are definitely needed for several of the parts like the upper housing and the roof of the lower housing.  I recommend tree supports with ~66% interface density. 

Items needed to build this filter:

• Wathai 120mm x 32mm Blower Centrifugal Fan https://www.amazon.com/dp/B08Q3Q2354?ref=ppx_yo2ov_dt_b_product_details&th=1
• Hoover Vacuum HEPA Filter (Hoover 440003905)  https://www.amazon.com/dp/B09PNF6VY3?psc=1&ref=ppx_yo2ov_dt_b_product_details
• Activated Charcoal https://www.amazon.com/dp/B0002566WO?psc=1&ref=ppx_yo2ov_dt_b_product_details
• Women's Pantyhose or other fine mesh for the bottom of the charcoal filter housing
• CA or other glue to glue mesh to bottom of housing (Will be held by bolts when assembled)
  • I recommend buying an assortment from Amazon/Aliexpress.  Many of these can be longer, you may just have some threads sticking out.  

Use at your own risk.  I recommend that you have at least a high level understanding of how filtration systems operate and the risks involved.  This is a universal filter setup and changes may need to be made for your specific situation and use.