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This adapter adds an extra filtering stage to your original filter. I'm repurposing a spare filter from an old Toppin Vacuum Cleaner. While it's not a HEPA filter (which is generally recommended), it offers better filtration than the original one.
A Fusion360 file is available, allowing you to adjust the design to your specific needs.
Please verify the dimensions of the charcoal filter for the K1 and K1 Max models, as they may differ from those of the K1C and let me know if it fits.
The author marked this model as their own original creation.