40MM NATO (RD40X1/7) to Delta Plus M3000 Mars Series Filter Adapter

thingiverse

40MM NATO (RD40X1/7) to Delta Plus M3000 Mars Series Filter Adapter ======================================================== This prototype design for a 40 MM NATO, gas mask thread, to legacy Delta Plus M3000 Mars series filter adapter makes any RD40x1/7 threaded full face CBRN masks compatible with Delta Plus line of legacy Mars series chemical, combination, and particle filter cartridges. This compatibility helps mitigate PPE shortages by expanding greater cross compatibility of respirators and filters to other manufacturer models. Part Description: ============ 40MM_TO_DELTA_PLUS_M3000_ADAPTER_GEN1.stl Single piece construction adapter for Delta Plus M3000 Mars series filters that does not require clocking. The legacy nature of the filter led to a decision not to design a two piece version that is backwards compatible with the 40MM to 3M outer shell. Disclaimers/Risks: ============== 1.) Use Proper Gaskets It would appear that the Delta Plus M3000 Mars respirators have the gasket on the filter side. However, please ensure to use Teflon tape on threads and that the gasket or o-ring is properly installed between assembly joints for a proper seal. 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 until they are taught against your face, ensuring no obstructions around the periphery of the seal against your face either due to 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 you are running only one filter, ensure the opposite port has a 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. It is highly recommended that 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 respirators, adapters, and accessories for their institution and workplaces. Dev. Notes: ========== 04/24/2020 - Initial model release. I do not have any Delta Plus series respirators or filters to check measurements, so please report back in comments for any fitment issues and I will release revisions as required. Credits: ====== Thanks to mikrobi2 for his Delta Plus M3200 to 3M adapter design. I extrapolated the male side threads based on his female threads. https://www.thingiverse.com/thing:4250909