Enhanced Activated Charcoal Filter for Creality K1 Series Printers

This filter for the Creality K1 series printers allows the user to add more activated charcoal for an enhanced exhaust air filtration. The mount of the filter matches the geometry of the stock filter and therefore this filter attaches to the printer in the same manner as the stock filter.

This write-up assumes the following:

• 0.4mm nozzle.
• Print settings are referred to in OrcaSlicer. Similar settings may or may not be present in other slicers and they may have different names.
• Parts are printed in PLA (or your solid material of choice).

Print Order:

1. Internal mesh

The internal mesh has to be printed first as it will be inserted into the body during printing. No modifier is needed for this part as we will tweak some slicer settings to achieve what we want.

Slicer settings that matter:

• 4 wall loops (this will define the rim width of the mesh which is to be fused with the body during printing). Assumes 0.42 line width.
• Alternate extra wall enabled. This setting adds an extra wall every other layer and provides better contact and adhesion between the rim of the mesh and the infill. It also brings the rim to the final desired width.
• Zero top and bottom layers.
• 20% rectilinear infill with at least 25% overlap with the inner wall. Increase overlap if you have problems with infill detaching from inner wall.

2.  Cap

The cap may be printed in the same job with the internal mesh. The cap will need a modifier. After inserting the cap on the plate and auto-orienting it, right click and add the modifier (Cap Modifier). It should fall in place automatically and placement does not need to be changed.

Modifier slicer settings that matter:

• 1 wall loop with alternate extra wall enabled.
• Zero top and bottom layers.
• 20% rectilinear infill with at least 25% overlap with the inner wall.

Print settings for the rest of the cap geometry: your favorite profile.

3. Body

Print the body in your favorite profile settings. At the layer height where the cavity for the mesh is finished, you will need to add a pause so that the mesh can be inserted mid print. In my case (0.25 first layer height and 0.2 layer height), this height is 16.25mm and the layer number is 93. Position this part where it's the most convenient for you to insert the mesh when the print is paused. Resume the print and the mesh should be fused with the body. No supports are needed to print this part.

Optional: add a height range modifier from 18.40mm to the top of the body and use 1 wall loop with 100% infill to add strength to the mounting interface. Since the mount geometry is designed to match the stock filter, it's rather thin. If you handle the filter gently when mounting and dismounting, you shouldn't really need this.

The .3mf project file for OrcaSlicer is attached.

Note: Adding more charcoal essentially means more flow restriction. On that note, you will need to run the exhaust fan at higher speeds than what you're used to. This also means that you will get less air suction at 100% than what you're used to and therefore, the chamber will run hotter.

Disclaimer: While this filter is designed to enhance exhaust air filtration, it does not fully eliminate it. Printing with filaments that are known to cause health issues can be dangerous and it's best practice to vent the exhaust out of the living space completely. I assume no responsibility on the health issues resulting from the making or the use of this filter.