3D Printed CoronaVirus Respirators

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jferguson
Posts: 197
Joined: Mon Mar 30, 2015 7:26 pm
Location: St Petersburg, FL

Re: 3D Printed CoronaVirus Respirators:update

Post by jferguson » Sat Mar 28, 2020 6:42 pm

i printed the straight from the box Montana Doc mask.
Of course it didn't fit well. I think I can make a much better fit by varying the scale in three axes, not forgetting to also adjust the scale of the "grille."

I fussed with the settings to print PETG but it still took 5 1/2 hours to print the mask and grille.

Janet has now made five of the plaited style of surgical mask. They work fine and use the same material we have foe the Montana mask, so I think I'm not going to pursue this further.

As an aside, we've found that when we wear the masks outdoors, people really give us plenty of room.

john

airscapes
Posts: 454
Joined: Wed Jan 31, 2018 11:36 pm

Re: 3D Printed CoronaVirus Respirators:update

Post by airscapes » Sat Mar 28, 2020 7:00 pm

jferguson wrote:
Sat Mar 28, 2020 6:42 pm


As an aside, we've found that when we wear the masks outdoors, people really give us plenty of room.

john
Yeah they are soo stupid. No mask and they walk right next to you.. not sure if people don't know how long of a distance 6ft is, or they are all just stupid.. No wonder we are #1... :x

TomR
Posts: 30
Joined: Wed Dec 03, 2014 3:12 pm

Re: 3D Printed CoronaVirus Respirators

Post by TomR » Mon Mar 30, 2020 8:14 pm

I have been using another design also by a Dentist: https://firedbycorona.com This mask takes 3.5 hours to print and I have been using ESun PetG. The fit is great. I just have to sand a little on the cheek for a great fit. For a filter, I used a 3M filter by Filtrete: Advanced Allergen, Bacteria & Virus. This is a true HEPA filter for 99.97% particles of .3um (Walmart $17). Disassembling yielded a 15ft roll 6.5in wide (makes 30 filters). I made a template to outline the filter and used hair bands to connect it to the mask (18 for $1 at dollar tree). I used a thinner hair band (30 for $1 at dollar tree) to loop through the mask tie holder. Two looped together fits behind ear but is a little tight for all day use so I am working on a clasp. This mask is very form fitting and breathable.

Check out the website listed for the STL file and see how he finishes the mask for use. What I like is with PetG, the glass transition temp is about 80*C. My dishwasher's sanitize cycle is 65*C and the best estimate I could find is 56* kills Corona virus so I use the dishwasher to disinfect the mask. PetG also seems to tolerate a spray disinfectant very well. For the filter, I have a UVC unit (Homedics for $99) but that is now out of stock. To even get a better seal I ordered Creature Liquid Latex (8.99) from Amazon to make a sealer band. This is a slow process but the people I have given them to seem very appreciative.

If any body has any suggestions please post.

Tom

jferguson
Posts: 197
Joined: Mon Mar 30, 2015 7:26 pm
Location: St Petersburg, FL

Re: 3D Printed CoronaVirus Respirators

Post by jferguson » Mon Mar 30, 2020 11:15 pm

Hi TomR,
this looks like a much better design than what I did. What did you slice it with, and print?
thanks for alerting us to this.

John

TomR
Posts: 30
Joined: Wed Dec 03, 2014 3:12 pm

Re: 3D Printed CoronaVirus Respirators

Post by TomR » Tue Mar 31, 2020 2:12 am

I use Simpify 3D on a MakerGear M2 printer. I now use a hair band through the side holes and loop them. Then I take a head band and cut it and connect it to the loops with a clasp I made. Really comfortable. Let me know if you want images of final product.

Tom
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jferguson
Posts: 197
Joined: Mon Mar 30, 2015 7:26 pm
Location: St Petersburg, FL

Re: 3D Printed CoronaVirus Respirators

Post by jferguson » Tue Mar 31, 2020 4:24 pm

HI TomR,
Did you seal the PetG part of the mask, and if so with what?

Also,in full knowledge of the imposition of asking this, is it possible/easy to share the first part of your g-conde with us?

Simplify3D gcode contains all of the settings in the first several page equivalents. Having this information would make it really easy to dial up the same configuration you used.

Someone may be able to suggest a simpler way to do this, if you are so disposed.

We've encountered a couple of respirator wearers at the early (very early) old peoples' shop at the supermarket. Both were nurses on their way home from what we used to call the "graveyard" shift. For some reason, they don't call it that. Maybe it's just an expression we used at the factory.

A few surgical masks that looked like real ones, and then our home-made plaited version.

Few people on streets in St Petersburg and next to none wearing anything like this. I suspect our infection rate and death rate are much higher than published. It is almost impossible for even medical staff to get tested as of yesterday. Deaths take days to show up in the database. We were up to 5 in our county last night, some added many days after they departed - possibly because of time it took to get test results , or ???

My M2 is in my rented shop a mile west of our apartment. The computer in the shop runs Ubuntu Linux 18.04. I installed VNC-Connect server on it. This is a product which for non-commercial use is free or voluntary subscription. With the VNC-client on my home system, I can call up and run the shop system with very little latency, watch OctoPrint webcam output, control the printer with Octoprint, etc. It is a God-send.

There are other ways to do this, and other VPN schemes, but this is simple, worked right away,and with thoughtful choice of passwords should be reasonably secure.

thanks again,
john

TomR
Posts: 30
Joined: Wed Dec 03, 2014 3:12 pm

Re: 3D Printed CoronaVirus Respirators

Post by TomR » Tue Mar 31, 2020 9:41 pm

John, for now I just cut a strip of kitchen towel and attach it inside the mask with double sided tape. What I want to do is have a formed fit rubber insert that will give a good seal. Now if I put my hand over the front opening and try to breath, it is quite forced so the seal is really pretty good even with nothing.

I have attached my setting for PetG. These are old but work for me. PetG seems to be in demand. All are backordered for a few weeks so I am running low. I do have PLA but being in florida they would warp when left in the car.download/file.php?mode=view&id=5640
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jferguson
Posts: 197
Joined: Mon Mar 30, 2015 7:26 pm
Location: St Petersburg, FL

Re: 3D Printed CoronaVirus Respirators

Post by jferguson » Wed Apr 01, 2020 12:29 am

thanks TomR. I look forward to discovering where I've messed up my settings so thing take too long to print. more to follow.

john

mscott
Posts: 1
Joined: Sat Apr 04, 2020 10:49 am

Re: 3D Printed CoronaVirus Respirators

Post by mscott » Sun Apr 05, 2020 1:53 pm

For those who need it, there are several different free 3D models of faceshields now available online (with strap options, etc.). You can find some 3D models here: https://top3dshop.com/3d-model-finder/?q=faceshield

As we all know, faceshields are just a little extra protection.The above-linked search engine also contains various breathing mask 3D models. By searching for breathing mask with screw-in filters, you will get a useful file for 3D printing your own mask. You can print a working mask using both PLA or ABS filament, but then you'll need to change/finish the surface of the printed model in order to reduce the risk of contamination.


Hope this will be of any help.

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