Honeywell/Honeywell North® to 3M™ Bayonet Filter Adapter

thingiverse

Honeywell/Honeywell North® to 3M™ Bayonet Filter Adapter =============================================== A prototype assembly for Honeywell/Honeywell North® threaded respirator to 3M™ bayonet-bayonet adapter, originally requested by nachoman6628 and Slayer667. Designed to help cross compatibility of COTS filters with other manufacturer’s respirators to help mitigate this PPE shortage. This adapter is unique from others currently available, allowing the user to clock filter cartridges at any angle separately from the bayonet indexing orientation. Additionally, the adapter assembly uses RD40 threads a bridge across the adapters, by stepping Honeywell/Honeywell North® threaded respirator to RD40x1/7 threads, and then down from RD40 to 3M™ bayonet. Although this was one possible pathway solution already available with presently released RD40 adapters that wasn’t as clear cut to an average lay person that the RD40 could serve as a bridge to step up and down, therefore the reason for this assigned an thingiverse part number for this assembly And also dedicated a page as a place holder for potential more direct adapter lower weight design without RD40 threads if time present itself Part Description: ============== 40MM_TO_3M_BAYONET_ADAPTER_INNER_SHELL_GEN5.stl 40MM_TO_3M_BAYONET_ADAPTER_OUTER_SHELL_GEN5.stl HONEYWELL_NORTH_TO_40MM_NATO_ADAPTER_M25.889x1.554_GEN3.stl HONEYWELL_NORTH_TO_40MM_NATO_ADAPTER_M26X1.57_GEN3.stl HONEYWELL_NORTH_TO_40MM_NATO_ADAPTER_M27X1.5_GEN3.stl RD40_GASKET.stl Initial assembly released, from two previous released parts: Honeywell/Honeywell North® to 40MM NATO (RD40x1/7) Thread Adapter https://www.thingiverse.com/thing:4278921 40MM NATO (RD40x1/7) to 3M™ Filter Adapter https://www.thingiverse.com/thing:4245358 Since we seem to be still chasing the proper Honeywell North threads, as different individuals have reported different thread sizes that work, thus three variants are provided., and since I do not have a 3D printer or Honeywell printer, I cannot confirm which thread is actually true. Disclaimers/Risks: ============== 1.) Use Proper Gaskets and Assembly Notes Requires gasket/o-ring, below bayonet to ensure proper seal between cartridge and bayonet, shimming maybe required. Note using different durometer will result in lesser or greater friction bayonet engagement than from OEM. 2.) Perform Proper Negative Pressure Test Follow SSPs established by your institution or workplace for further guidance. But in general, don your respirator, adjust straps till taught against face, ensuring no obstructions around the periphery of the seal against face either due from hair, facial hair, or otherwise. Exhale deeply. Cover all inhalation ports. (Typically, most full face or half face respirators have two filters, so cover those intake ports with your hands. If your running only one filter, ensure the opposite port has filter cap in place.) Now inhale deeply. The mask should suck tightly against your face without any air leakages. Re-test if adjustments are required at gasket/o-ring interfaces at the adapter. 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. In addition to using a properly calibrated 3D printer, due to tolerances of adapters, if possible perform hot nozzle pass on all exterior surfaces, to reduce surface porosity for FDM based methods, otherwise SLS/SLA method preferred. Highly recommended users apply a thin layer of polyurethane clear coat on all exterior surfaces, spray or dip based methods, to help resiliency and durability for repeated sterilization and to reduce fomite transmission in printed infill layers. Once supply chains return to normal, users should purchase OEM OSHA/NIOSH/EN standard approved/conformed respirators, adapters and accessories for their institution and workplaces. Dev. Notes: ========= 06/05/2020 - Initial model release. In work, pending 3D printing community support for any fitment and model revisions.