May 5, 2020
Description
This prototype design for a Milla EURMASK® ETNA respirator to 40MM NATO (RD40x1/7”) gas mask thread adapter. Designed to help cross compatibility of commercial off the shelf (COTS) filters with other manufacturer’s respirators during this global PPE shortage. In this particular case, Milla EURMASK® ETNA bayonet series respirators can now be compatible with any RD40x1/7” threaded canisters or step down adapters to other respirator manufacturer filter cartridges.
If you cannot source 40MM NATO (RD40x1/7”) thread filters, then you can step down to the following adapters below:
40 MM NATO to 3M™ Filter Adapter
https://www.thingiverse.com/thing:4245358
40MM NATO to Scott® 742 Series Filter Adapter
https://www.thingiverse.com/thing:4347531
40 MM NATO to MSA® Bayonet Filter Adapter
https://www.thingiverse.com/thing:4265715
40MM NATO to MSA® Comfo Classic Filter Adapter
https://www.thingiverse.com/thing:4267676
40MM NATO to Honeywell/Honeywell North® Filter Adapter
https://www.thingiverse.com/thing:4268775
40MM NATO to Honeywell Sperian® Filter Adapter
https://www.thingiverse.com/thing:4297348
40MM NATO to Honeywell Safety Sperian® /Survivair™ ValuAir® (Bayonet) Filter Adapter
https://www.thingiverse.com/thing:4345345
40MM NATO to AOSafety® Threaded Filter Adapter
https://www.thingiverse.com/thing:4273365
40 MM NATO to AOSafety® R5700 8051 Bayonet Filter Adapter
https://www.thingiverse.com/thing:4265538
40MM NATO to Portwest® Bayonet Filter Adapter
https://www.thingiverse.com/thing:4273464
40MM NATO to Moldex® 7000/9000 Series EasyLock® Bayonet Filter Adapter
https://www.thingiverse.com/thing:4275446
40MM NATO to Secura BC Bayonet Filter Adapter
https://www.thingiverse.com/thing:4294187
40MM NATO to JSP® Force™8 Filter Adapter
https://www.thingiverse.com/thing:4294203
40MM NATO to Delta Plus M3000 Mars Series Filter Adapter
https://www.thingiverse.com/thing:4311197
40MM NATO to Delta Plus M6000 Jupiter Series Filter Adapter
https://www.thingiverse.com/thing:4311200
40MM NATO TO GOST 8762-75 Threaded Filter Adapter
https://www.thingiverse.com/thing:4321450
40MM NATO to Draeger X-plore® Filter (3000/5000 Series) Adapter
https://www.thingiverse.com/thing:4329276
40MM NATO to ENHA Rockman 7300 Series Filter Adapter
https://www.thingiverse.com/thing:4329610
40MM NATO to Sundstrom SR Series Filter Adapter
https://www.thingiverse.com/thing:4338105
40MM NATO to Milla EURMASK® ETNA (Bayonet) Series Filter Adapter
https://www.thingiverse.com/thing:4342320
40MM NATO to Milla EURMASK® (Uno/New) Series Threaded Filter Adapter
https://www.thingiverse.com/thing:4342343
And if no filter cartridges are still available to you, then there are many DIY filter solutions on thingiverse that are compatible with each of the major manufacturer’s respirators, for 3M, MSA, etc.
MILLA_EURMASK_ETNA_BAYONET_TO_40MM_NATO_ADAPTER_GEN1.stl
Initial model release.
1.) Use Proper Gaskets
Requires 40 mm OD gasket or o-ring on the interior pocket for RD40x1/7 threads.
Requires gasket underneath the bayonet, nominal ID of 25.596 MM.
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. 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.
05/05/2020 - Initial model release. In work, pending 3D printing community support for any fitment and model revisions.
Thanks to drzejkopf for his Milla EURMASK® ETNA to DAR filter adapter design.
https://www.thingiverse.com/thing:4318660
License:
Creative Commons - Attribution - Non-Commercial
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