K2 Plus Carbon & HEPA Filter w/ Heater Deflector

K2 Plus Carbon & HEPA Filter w/ Heater Deflector

• Update July 31, 2025:  Added a new version of the Carbon Inserts.  The grid pattern was giving some users trouble.  I’ve changed this to print similar to rectilinear infill.  So each layer of the grid prints one direction, bridging over the previous layer.  I’ve printed these roughly 20x.  I found editing the print settings for these can speed them up with little to no impact on quality, and the bridged grid is actually stronger than the original design.  Settings I changed for these objects: 
  • Bringing Speed 200mm/s
  • Seam Gap 0%
  • Disable slowdown for overhang walls
  • 4 walls
• I had a request to make a version that used screws/heat set inserts - that will be coming next.  Thank you for the feedback!

Update: July 12,2025 - I have updated the heater duct to v7.    Original duct (v2) I noticed some warping after a 12 hour 60* chamber print.  v7 Duct I was able to print a 12 hour 60* chamber print with minimal warp.  Fundamentally - I think a higher temp resistant material than ASA would be beneficial - the heater blasts this part with a lot of direct heat, particularly if you’re stress testing with only the chamber heater and no bed heater aiding in warming the chamber.  

This requires no hardware to install, and no supports to print.  This will let you used various air filters.  The design is primarily built around a 101mm air filter like the Osimo A2 air filter. 

I will list all the filters than can be used with this design below.  All of my links are not affiliate, and I have purchased all of these filters myself to design around and test against.  

This does require taking the back cover off the printer to access 4 screws which hold the heater cover.

I will be adding more filter adapters.  Releasing this now for those on Reddit waiting for it.

Print List

• Print all 3 files in Folder: Base Plate, Heater Diffuser, & Carbon Inserts
  • Note - the diffuser duct prints standing up without supports 
• Print 1 file from Folder: Filter Housing 101mm
  • 31mm tall (open or with dividers) - this is for the Osimo A2 style filter, or other 101mm filter including a foam filter
  • 21mm tall (open or with dividers) - this is only for the adaptered filters listed below
    Note - the purpose of the dividers is for holding a foam insert as a prefilter
• Optional: If using iLife or Shark filters, print the appropriate adapter
  • Print the file needed based on your filter, and the 101mm housing you printed (either 31mm or 21mm tall)

Print Settings

• 3 walls
• 5 top/bottom (1mm)
• 25% Gyroid infill
• Minimum Sparse Infill threshold: 25mm3 (this will make the snap tabs print solid)

Filters Supported 

• Fette Filter for Osimo A2
• 1” Foam Filter
• Shark Filters:   Example 1,  Example 2
• iLife ION Filters (same filters used in the Bento Box)
• iLife V8 (108mm x 100mm) - supports single or double stacking
• Activated Carbon - Any 3-4mm carbon pellets Example 1, Example 2

If you need another filter -  please comment it with an Amazon link so I can reference/design an adapter.

None of my links are affiliate.  If you’d like to support this design - https://ko-fi.com/ice992

Print all parts and test fit them together.  Add Carbon pellets to the carbon holders.  I use approximately 60 grams of carbon in each.  They will hold up to 90 grams, however this limits airflow entirely too much.  40-60 grams is perfect.  The covers slide in to place and have a small click to lock in place.  Note - the stock carbon filters  have 12 grams of carbon in them.

Once complete and ready to install begin disassembly.  Remove stock exhaust fan covers and stock carbon filters.  Remove the machine back cover.  Remove the 4 screws holding the heater cover.  

Snap Base plate into place, sliding bottom edge/tabs in first.  Once clipped into place, you can screw the 4 screws back, and then reattach the back cover of the machine.

Insert carbon filter holder, snap air filters into place, and snap heater diffuser into place (top edge first).  Enjoy!

The Filter housings and heater diffuser duct have small indents in them to help with gripping to remove and install.

Ratings/Makes are appreciated!

I will update this in the coming weeks to include some data I gathered while testing different filters.