SLOR N95 Holder

This design has been tested and is suitable for community use, but at this time does not meet the full requirements for use in a clinical setting.

Submitted by:

jeremyralston

Wed, 2020-04-08 13:18

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General Information

Model ID

3DPX-013661

Category

Labware & Devices

Device Use

Safety and Personal Protective Equipment

Keyword(s)

SLOR N95 Holder PPE Covid-19 Healthcare Front-line and community

There are many wonderfully creative implementations of n95 masks and fabric holders, some of the most popular being from the Billings, MT and LowellMakes in MA. As a collaboration between the Jeremy Ralston, Engineering Manager of the SLO Surgery Center, Cristian Sion, a Cal Poly Engineering student, and Clint Slaughter, MD, a local ER physician with Vituity, French Hospital ER, and SLO MakerSpace, we were able to bring the independent work we were each doing into a single project that remixes some other designs into a community mask alternative.

We have modified the Billings community mask model to include a larger filtration area for better airflow, an extended chin area, thinner walls to allow heat-molding to a user’s face, and added a cap similar to the LowellMakes mask to allow the entire mask to be sanitized between patients. This provides a safe, effective, and locally producible way to markedly extend the supply of n95 masks.

This n95 holder is able to achieve subjective n95 fit testing on a wide variety of people, with the fit adjustable by heat molding and the installation of weatherstripping for comfort and an improved seal. This is not a NIOSH-approved device, but it functions as a holder for NIOSH-approved n95 material and we therefore consider this an extension of already approved equipment, which may allow for easier approval at your site.

The mask can be 3D printed on home machines, any elastic, rubber band, or similar can be used for straps, and either properly handled used n95 respirators or new n95 disposable respirators can be used to make 1-4 SLOR masks.

edits from Natronwong

Summary

Instead of printing the full mask only to find out it doesn't fit you well, print these different "sizes" to try out. The original mask can be scaled in the X and/or Y planes to get a perfect fit for you. For example, I found that if I scaled it to 90% in just the "nose to chin" dimension then it was a perfect seal for me.

The sizes I uploaded called 100%, 90%, and 80% are scaled in both X and Y dimensions. The size called 90% wide is only scaled down in the "nose to chin" dimension. The width is the same as the original. This was a perfect fit for me personally.

Alternatively, you can use this Mask Rim over a surgical mask to enhance the fit and seal of a basic surgical mask.

Segmentation Software

Cura/QIDI

3D Modeling/CAD Software

Autodesk Fusion 360

Model Origin

Billings MT REMIX

External Derivative Source

Billings Mt Mask

Model Details

Medical Application

Active and Wearable Devices›Other

General Equipment›PPE and safety accessories

How to Make

Printer Make/Model

QIDI x-Plus

Print Units

Scale At Given Print Units

100%

Printer-specific Build Instructions

Specific material

PLA or TPU- TPU for best results and flexibility

Number of prints per build

Build time

2.5hr-6hr

Pre- and Postprocessing Instructions

Print Settings:

We used these settings as well as the default settings on a Creality 10S Pro and a Lulzbot Taz6, respectively, adjust to your printer.

Note: scale down to 90-92% if small face structure;

QDI X-Plus

Layer height- 0.3 Print speed- 80 mm/s

Layer width- 0.4 Travel speed- 100 mm/s

Wall line count- 2 Printing Temp- 215C

Top layer- 4 Bed Plate- 50C

Bottom Layer- 4

Infill- 15%

Assembly:

take the holder and use the 300 grit sandpaper and smooth the inside about a ½” inside the mask. Makes for a better seal when apply the stripping.
Take the weather strip and apply it on the inside edge.

Cut filter like 3”x3” square like picture below and place filter in like above picture

I cut a latex-free rubber band on one side to make one long piece. Then ran it through both loop and applied the clasp. What is nice about these clasps is the adjustability

Attribution

Attribution Instructions

slorholder@gmail.com

http://www.slomakerspace.com

https://www.serviceforslo.com/

https://www.additiveengineering.biz/slor

Documentation

Supplemental Documentation

FDA approval of Filiment.docx

Testing of PLA-TPU-Nylon.docx

SLORholder.docx

Reviewer Notes

Dear author,

Thank you for submitting your design to the NIH 3D Print Exchange.

You are receiving this message because your submission uses terminology that may not reflect the device function. Any term used in the title, description, or documentation must conform to the guidelines outlined by the FDA. There is no record of your device meeting the specific standards required to be labelled as a "functional N95 repirator alternative". Any instance of the term "functional N95 repirator alternative" will be replaced with “community use face mask" so that there is no miscommunication with users of the NIH 3D print exchange about the efficacy of PPE on the site. Please let us know if you would prefer not to accept the changes, and we will instead place your design back into prototype status. Please let us know if the changes in terminology are not acceptable within 3 business days (1/15/21).

Thank you.

This device is a general purpose face mask intended for use in the community and is not suitable for use by a healthcare professional or in a healthcare facility or environment, as described in FDA Guidance Enforcement Policy for Face Masks and Respirators During the Coronavirus Disease (COVID-19) Public Health Emergency, Section V B. This device has not been tested to assess the out-gassing limits of the material or their corresponding health effects.