mask 3 types of filters Free 3D print model

The mask can accommodate 3 types of filters, two spongy filters and a 2mm fabric filter.For the spongy ones I used two 7mm hood filters with an activated carbon layer.For the fabric one I used a circle of insulating fabric made from a clean slip protector.To increase the comfort and ergonomics I inserted a sponge on the inside so that it fits perfectly without leaving spaces.