Prefabricated antibacterial paper mask with replaceable filter designed by Lead Designer of BMW Group Designworks - Evgeny Maslov, is getting more attention nowadays.

The Bumask is an open-source face mask made of cardboard with a replaceable filter to guard against excess viral saturation. It helps prevent penetration of the coronavirus to the respiratory tract via airborn particles and facial contact. It can be made either independently or on any available domestic printer. It is simple to make and to replace the filters (which are also made of easily obtainable materials). Plans and instructions are openly available as a PDF download.