Cpap Mask Filter Adapter

thingiverse

This is an adapter for CPAP masks designed specifically for use as a respirator type mask. It is intended to function seamlessly with CPAP masks featuring a 22mm hose attachment point. A press fit is possible, but relief cuts are provided for added versatility in accommodating zipties or hose clamps. To enhance the seal between the adapter and the mask hose attach point, it's highly recommended to use a sealing material such as electrical tape. A single layer of this type of tape works exceptionally well. The adapter is best printed with PETG due to its ease of cleaning and disinfecting, as well as slightly greater flexibility compared to PLA. Custom filters can be easily integrated into the system. To create the filter, cut a square approximately 44mm in size with 3mm rounded or chamfered edges. For optimal filtration performance, I recommend utilizing Carbon-coated MERV 16 or HEPA filtering material, which closely mimics the effectiveness of N95 respirators. Notably, Merv 16 can filter out 85% to 95% of .3 micron material and >95% of 1.0 Micron material. The filter is inserted into the front cover and secured within the adapter body through a simple pressing action. PETG (Polyethylene terephthalate glycol) has been deemed food-safe by the FDA, possesses non-porous properties, and does not dissolve in common 3D printing solvents like Acetone or Isopropyl Alcohol. While PETG is classified as food-safe and non-porous, it's essential to note that the layer-by-layer creation process inherent to 3D printing can create small crevices and areas where bacteria may potentially accumulate. To mitigate this risk, it's strongly advised to wash the adapter with warm water and soap after each use and then disinfect with alcohol. It's crucial to remember that PETG is not dishwasher-safe. Water temperatures above 150F can soften the material and potentially cause warping. Chemical smoothing poses a significant challenge due to PETG's inherent chemical resistance. While certain chemicals like MEK (methyl ethyl ketone), toluene, and cyclohexanone may have the potential to dissolve and smooth the plastic, these substances are heavily regulated and can be hazardous to handle.