Eagles

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:

hleskovics

Thu, 2020-04-16 08:10

Vertical Tabs

General Information

Model ID

3DPX-013885

Category

Labware & Devices

Keyword(s)

PPE, face mask, corona, COVID-19, Coronavirus, Montana

We took the montana mask, found at makethemasks and changed the size to be smaller and the opening to be circular. This was for the purpose of N-99 filters that are 2" and are used by allergist in a spirometer. We have also used the Rigid VF6000 filter vacs as well as the Filtrete 1500 and 1900 filters and cut into small squares. On the inside we have lined them with rubber window weather stripping for a tighter seal. What makes our unique is that if you have an allergist in town and can get access to the N-99 circular filters used by many of them, that our design was made for, then this is the best way to go. I have included a picture of the filter a well as the packaging.

3D Modeling/CAD Software

Tinkercad/ Autodesk Fusion 360

How to Make

Printer Make/Model

Dremel 3D40 and Dremel 3D45

Print Units

Scale At Given Print Units

Printer-specific Build Instructions

Specific material

PLA

Number of prints per build

Build time

9 hours for two

Pre- and Postprocessing Instructions

Instructions:

You can choose to print the small (118.82 mmx 98.53mm), the medium (122.79 mm x 101.79 mm) or the large (132.03mmx 109.47 mm), the gasket file is the same size for all three (51.50)
The most common size is the Medium.
After you have your mask and gasket you will want to attach elastic . You can use 1/8" or 3/8 " depending on how thick you want your bands. I will put a picture of how I tie them on my post.
Next you need to get rubber window seal, I use the Seal Weather Stripping White 52 feet/16m Epdm foam seal strip by Savina Anti-Collision Self Adhesive from Amazon. I peel off the back and press it around the inside rim of the mask andthen cut just a little tiny over to stick a drop of super glue and let it seal together. Again you can see this in my pictures.
Last step is the filter. You can use several things. If you know an allergist these were designed with the 2" circular front and gasket to hold an N-99 filter that allergists use in theor spirometers. They can buy these for you in bulk if you are interested. The other options are to use a Air filter and cut up squares. I have been using the Filtrete brand 1500 or higher. You can also use the Rigid VF 6000 shop vac filter and cut into squares it also collects 99.97 particles that are at least .3 micron in size.

You can look at my pictures to see all of the above.

Dremel 3D40 Specifics:

Slicing Profile: Standard PLA

Supports: none

Layer Height(mm): .2

Number of perimeters: 2

Bottom/top thick(mm) : .6

Infill Density in: 25%

Bottom layer speed(mm/sec): 10

Print speed(mm/sec) : 40

Traveling speed(mm/sec) : 110

Retraction distance(mm) : 1.5

Temperature & cooling

Extruder(C) : 220

Cooling fan : yes

Fan speed min(%) : 100

Fan speed max(%) :100

Fan full on height(mm) : .2

Minimal Layer Time(sec) :10

PRINT TIME FOR TWO MEDIUM MASKS AND TWO GASKETS: 9 hr 12 min

Dremel 3D45 Specifics:

Slicing Profile: Experimental PLA

Supports: none

Layer Height(mm): .2

Number of perimeters: 2

Bottom/top thick(mm) : .8

Infill Density in: 25%

Bottom layer speed(mm/sec): 10

Print speed(mm/sec) : 40

Traveling speed(mm/sec) : 130

Retraction distance(mm) : 1.5

Temperature & cooling

Extruder(C) : 220

Heated Bed: 70

Cooling fan : yes

Fan speed min(%) : 100

Fan speed max(%) :100

Fan full on height(mm) : .2

Minimal Layer Time(sec) :5

PRINT TIME FOR TWO MEDIUM MASKS AND TWO GASKETS: 9 hr 52 min

NOTE: The above is using HATCHBOX PLA

When I could not get HAtchbox I tried Geetech and Sunlu and for BOTH of these I had to reduce the extruder tempertaure to 210 as well as the treavling speed to 100!!! Weird but the filaments are just different. I would stick with Hatcbox if you can get it. It is the most consisitent filament I use and I print A LOT all year. I print for students in grades 2-5.

Reviewer Notes

For documentation purposes, we cannot accept links to external websites for printing instructions, instructions for use, etc. Instructions need to be included as a PDF or as text on the NIH 3D Print Exchange website.

Models need to be split and uploaded individually.

- 04.30.20

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.