About this 3D model

This adapter takes 2 or 3 fiters. For long time use at once, 3 filters makes it easier to breath. If use only 2 filter, must cover the 3rd with provided cap model. The filter inner diameter 22.5mm Mask model: M2068G In my print, I use ABS, but any material will do. If the printed part seems too tight, rescale 1 or 2%. It will depend of your settings. After print, some cleaning might be necessary for a best and smooth fit.