40MM NATO (RD40X1/7) to Secura BC Bayonet Filter Adapter

thingiverse

40MM NATO (RD40X1/7) to Secura BC Bayonet Filter Adapter ===================================================== This innovative prototype design for a 40 MM NATO (RD40x1/7), gas mask thread, to Secura BC bayonet filter adapter offers a unique solution by allowing users to adjust the position of the bayonet/cartridge separately from the RD40x1/7 threads. This adapter makes any RD40x1/7 threaded full face CBRN masks compatible with Secura BC chemical, combination, and particle filter cartridges, helping to mitigate PPE shortages by expanding cross compatibility of respirators and filters across multiple manufacturer models. Part Description: ================ 40MM_TO_SECURA_BAYONET_ADAPTER_MONO_GEN1.stl Single piece construction adapter, ideal for Secura BC bayonet filters that do not require clocking. 40MM_TO_SECURA_BAYONET_ADAPTER_OUTER_SHELL_LOW_GEN1.stl 40MM_TO_SECURA_BAYONET_ADAPTER_INNER_SHELL_LOW_GEN1.stl Two piece construction, designed for clocking purposes and backwards compatible with the outer shell of the previous Gen 4 40 MM to 3M bayonet adapter. Tolerances are more forgiving, allowing for ease of use with 3D printer variations. 40MM_TO_SECURA_BAYONET_ADAPTER_OUTER_SHELL_HIGH_GEN1.stl 40MM_TO_SECURA_BAYONET_ADAPTER_INNER_SHELL_HIGH_GEN1.stl Two piece construction, designed for clocking purposes and backwards compatibility with the outer shell of the Gen 3 40 MM to 3M bayonet adapter. Higher tolerance parts require proper scaling and calibration of a 3D printer. Disclaimers/Risks: ================ 1.) Use Proper Gaskets Requires a gasket or O-ring on the interior side to ensure a proper seal between the cartridge and bayonet. Source a gasket or O-ring with a nominal diameter of 25.2 mm or ~1.0". 2.) Perform Proper Negative Pressure Test Follow SSPs established by your institution or workplace for further guidance. Adjust straps until taught against face, ensuring no obstructions around the periphery of the seal against face due to hair, facial hair, or otherwise. Exhale deeply, cover all inhalation ports, and inhale deeply. The mask should suck tightly against your face without any air leakages. 3.) Use At Own Risk – Temporarily Solution Only Until Supply Chain Normalizes 3D printing materials are not resistant to many solvents, are water soluble, and degrade when exposed to chemicals, heat, and UV/sunlight. 3D printing this adapter is only a temporarily ad-hoc solution against biological contagions. Perform a hot nozzle pass on all exterior surfaces to reduce surface porosity. Highly recommended users apply a thin layer of polyurethane clear coat on all exterior surfaces for added resiliency and durability. Dev. Notes: ========== 04/17/2020 - Initial model release. I do not have any Secura series respirators or filters to check measurements, so please report back in comments for any fitment issues and I'll release revisions as required. Credits: ===== Thanks to Automagical2 for publishing his Secura series of Polish adapters that allows the 3D printing community to reference regional specific PPE bayonet geometry. United we stand as we combat this global PPE shortage together!