CoreOne HEPA and Active Carbon Filter New Version

UPDATE 2025-12-08:

New design of this is soon ready featuring a fan integration module. I will also update all these files for a non fan version as well. Still using three of the 82x42x14 HEPA filters.

UPDATE 2025-11-11:

I am working on some changes to this model and trying to see if I can neatly design a fan enclosure or ad on. I will also make a redesign to fit the larger Carbon Box closest to the chassis fans so that the HEPA filters will be last in terms of flow before an extra fan or a cover. If you have not downloaded and printed I advise you to wait a bit longer until I upload the new model.

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This HEPA filter with active carbon cage module is a redesign of my previous filter. This design place the HEPA filters first and thus enabling a larger cage module for the active carbon that will increase the total flow through the filter and enable better filtration. This is actually my third version of filter module for the CoreOne and this one works well so it is a keeper for me. 

You can also choose to swap out the cage for the active carbon to a cover only, or if you like only use the cage with active carbon and take away the filters. 

Everything is designed to be easy to work with without having to move your printer to change module or swap out the filters or change the active carbon. It is mounted using magnets with the guiding screw heads. 

You will need:

• 4 M3 screws 4-6 mm long with round protruding head. You should have some left over if you assembled the printer yourself. 

• 8 magnets, 10x3mm, i used these black ones that is strong.

• 3 filters, I have tested with these for ILIFE and these for ECOVAS.

• TPU filament for the gasket on the backside. 

• Glue.

Assembly instructions:

1. For all the .3mf files check the printer settings are correct for your printer. I recommend printing with PETG for durability. 

2. Print the Cage-Back.3mf

3. Print any of the Cage-Front_No-logo.3mf or Cage-Front_CoreOne-logo.3mf versions, depeding if you want the logo or not. 

4. Print Cage-Back.3mf

   1. Will give you two half's that you glue together, they have guiding grooves and protrusions to make it easy. 

   

5. Print any of the Cage-LID-ONLY_No-logo.3mf or Cage-LID-ONLY_CoreOne-logo.3mf versions to have an option to take away the Active Carbon cage when printing with filament where it is not needed. 

6. Print Main-Body_82x42x14.3mf, Main-Body_80x40x15.3mf or Main-Body_100x40x15.3mf depending on which filters you have purchased. 

   1. Measure your filter first, but these cheep filters are soft so you can squeeze them in even if the sizes is not spot on.  

7. Print the Fill-Guide.3mf, use some left over PLA, this will be helpful when poring in the Active Carbon pellets. 

8. Now you have all the parts, next is to start with the assembly. 

9. Cut a string of TPU filament 

10. Push one end down into the grove, use the side of a screwdriver to then press and slide the TPU filament around to the start again and cut it off. 

    

11. Drop glue into the magnet holes and press down the magnets. 

12. Install the filters, should be a snug fit. Make sure the fabric flap is not bending over the TPU gasket. 

13. Take the glued cage and place the Fill-Guide on top then fill your Active Carbon pellets. Shake it so that it is full all the way up. This will be a bit messy and carbon dust will be on your table.

    

     

14. NOTE, when you have installed the cage with Active Carbon in the main body you should vacuum clean it to get rid of Carbon Powder else it will blow out on your wall behind the printer when you start it the first time. 

• The Cage and the LID is designed to snap and click in place. 

• Install 4 M3 screws 4-6 mm long with round heads on the back, these will act as a guide to position the filter correctly over the fans. 

• Now you can install your filter in the back of your printer. 

• Best to set the max chamber fans to 75% or 80% if you have that setting on 50%, but it depends on what modules, what filter and what active carbon pellets you use. 

I carefully designed the parts to have good tolerances and good fit ( and used a bunch of PLA :-) ) but do take it easy in the beginning when switching between cage and LID so that you do not break the mounting pins on the Main body part. 

Hope you like it and perhaps my efforts are worth a cup of coffee:
https://buymeacoffee.com/ne3d

The files provided are for personal use at your own risk. I make no warranties, express or implied, regarding the safety, reliability, or suitability of any printed models. You are solely responsible for verifying that any downloaded design is safe, functional, and appropriate for your intended use, including but not limited to material choice, print settings, and post-processing. By downloading or using these files, you agree that I am not liable for any damages, failures, or consequences resulting from their use.