3M Mask to DAR filter adapter

>>Adapter piece for standard 3M half-face mask to DAR viral/bacterial filters commonly found in hospitals

UPDATE 06-04-2020: 6200, 6800 and generic mask (eg. Sikko) adapters have been uploaded. 7500 version coming soon. If your adapter feels loose on the mask, try the "generic" version - it is meant to fit masks that have a looser adapter/thinner gasket than the original 3M ones.

UPDATE 05-04-2020: v4 introduces model markings on the adapter - based on the feedback we've found different 3M versions & clones have slightly different adapter dimension. Please use proper version to ensure a tight fit.

• DAR filter slot is now compliant with ISO 5356-1:2015
• Other adapter versions will be uploaded once verified (hopefully today)

UPDATE 03-04-2020: v3 is a new revised version that introduces: support-free printing, side designation (R & L) and tighter fit for DAR filter

This is a revision of a project that has been circulating on the internet for the last few days and it aims to solve some of the issues present in the original design:

• Rectangular, asymmetric design for easier handling when coupling/decoupling with the mask
• Shape of the adapter offers instant visual feedback of the correct placement - former cylindrical versions offers little to none, which can result in improper coupling and accidental disconnections
• The filter has been directed towards the back and the sides, which offers several advantages:
• Air inlet has been directed away from the patient side, not towards it
• Upwards air inlet position is much closer to the intended use as described by the manufacturer's product specification
• Re-positioning of the filter allows for greater freedom of movement when a face shield is used
• Wider flange offers extra seal around the adapter-mask interface, which was missing from the original design
• Filter piece is inserted in a way that even accidental removal of the cap from filter's luer-lock port does not expose the user to unfiltered air

Multiple versions of the adapter will be continuously uploaded here so that you can pick the right one for your mask. However some of the designs are based solely on remote feedback, as I am unable to buy/rent all of the masks due to financial constraints. If you want to help out, I will gladly accept masks for testing, or donations so that I can buy them to create the adapters. Thank you for supporting my work and making it happen.

Second filter can be replaced with a simple cap (will be soon added to the files) to reduce filter use - breathing is comfortable with even one filter.

Please note that the mask itself does not provide any filtration of the exhaled air! It is only intended to protect healthy individuals, eg. healthcare workers.

WARNING! This adapter might not be suitable for use with generic, off-brand clones of the mask (eg. Sikko) - please test the adapter-mask fit and make sure that it fits snugly enough to not get disengaged accidentally. For those masks try using the "generic" version of the adapter ("Generic-6200", clearly marked with a 'G' on the print)

This design would benefit from proper and rigorous testing to determine the quality of the seal, and maximum holding pressure - please contact me if you're interested in helping out.

This adapter was created as an emergency action in effort to protect people by providing backup options if the standard PPE becomes unavailable. This device has not gone through the same regulatory approval process as standard PPE. **Use at you own risk**. Make sure to follow your local guidelines.

Print instructions

Layer height: 0.2 mm
Material: PLA, PETG (others likely compatible)
Infill: 20%+
No supports

For proper seal make sure you us at least 3 perimeters (vertical shells). Use random Z-seam alignment for improved tightness. Make sure your flow rate is well calibrated, and that there are no gaps in the outer perimeters!

After printing please follow the fitting instructions found in the gallery! Make sure the adapter fits snugly, and cannot be disengaged accidentally.