3M™ Bayonet to MSA® Bayonet Adapter ====================================== A prototype design for 3M™ bayonet to MSA® bayonet adapter. Designed to help cross compatibility of COTS filters with other manufacturer’s respirators to help mitigate this PPE shortage.
Disclaimers/Risks: ============== 1.) Requires gasket/o-ring, below bayonet to ensure proper seal between cartridge and bayonet. Source some gasket or O-ring that is nominal ID 25.5 mm or ~1.0 in.
2.) 3D printing materials are not resistant to many solvents, are water soluble, and degrade when exposed to chemicals. 3D printing this adapter is only a temporarily ad-hoc solution against biological threats. Once supply chain return to normal users should purchase OEM OSHA/NIOSH/EN standard approved adapters and respirator accessories.
Dev. Notes: ========= 04/10/2020 - Initial model release. In work, pending support and feedback from 3D printing community for prototyping and feedback for revisions. Reworked the indexing tab on MSA® bayonet clock position so that when the adapter is tighten down on a 3M™ respirator it should clock properly, but please let me know any revision to the angle position is required.
04/13/2020 - Revised model based on feedback from 3D printing community. The following changes have been made: (1) chamfers added to 3M bayonet to filter mating surfaces to reduce sharp edges that could result in wear on 3M bayonet, (2) redone chamber from underside OD to wrench flats to reduce printing overhang supports, and (3) added engraved markings on exterior periphery to ID adapter.