40MM NATO (RD40x1/7) Coupler Set

thingiverse

Human: 40mm NATO (RD40x1/7) Coupler Set=============================This prototype design for a 40mm NATO (RD40x1/7/DIN) gas mask thread coupler set is created to enable male-to-female or female-to-male; male-to-male; and female-to-female couplings. Additional future RD40x1/7 straight walled and barbed couplings for various diameters will be added as requested. Designed to facilitate cross-compatibility of commercial off-the-shelf (COTS) filters with other manufacturers' respirators, during this PPE shortage, specifically for PAPR (Powered-Air Purifying Respirator) hose compatibility or system expansion. Or for increased standoff height for 40mm NATO filter cartridges clearances depending on other manufacturers' half or full-face manufacture's respirators.Part Description:============MALE_TO_FEMALE_40MM_NATO_COUPLER_GEN1.stlMALE_TO_MALE_40MM_NATO_COUPLER_GEN1.stlFEMALE_TO_FEMALE_40MM_NATO_COUPLER_GEN1.stlInitial model release of three-part RD40x1/7 coupling set.40MM_NATO_MALE_TO_30MM_STRAIGHT_WALL_COUPLER_GEN1.stl40MM_NATO_MALE_TO_30MM_BARBED_COUPLER_GEN1.stlFEMALE_40MM_NATO_TO_30MM_STRAIGHT_WALL_COUPLER_GEN1.stlFEMALE_40MM_NATO_TO_30MM_BARBED_COUPLER_GEN1.stl04/28/2020 - Additional RD40x1/7 male couplers released for 30mm, one straight walled and second barbed version, with 20mm grip length past the fillet, as requested by kkidfall. May you and your ambulance crew continue to stay safe, well, and healthy!Disclaimers/Risks:==============1.) Use Proper GasketsRequires a 40mm OD gasket or o-ring on the interior RD40x1/7 pocket to ensure proper seal maintained between cartridge and threads.2.) Perform Proper Negative Pressure TestFollow 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 you're 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 Normalizes3D 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. 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 respirators, adapters, and accessories for their institution and workplaces.Dev. Notes:========04/21/2020 - Initial model release. In work, pending support 3D printing community for any fitment and model revisions.04/28/2020 - Additional male RD40x1/7 couplers released for 30mm, one straight walled and second barbed version, with 20mm grip length past the fillet, as requested by kkidfall. May you and your ambulance crew continue to stay safe, well, and healthy!