Filter adapter for 3M masks

I've been printing a lot of these types of adapters to nearby medics lately. See here is a bent version that supposedly improves ergonomics: https://grabcad.com/library/3m-mask-to-dar-filter-adapter-2
It's not my design but it's supposedly better than the straight ones, but in what I'll only say after the weekend because I'll have a filter to test

It's generally hard to get these filters. Can I ask for a shop location in PW?

Instead of PLA, you could have used PET-G.

Mscichu wrote:

See here is a bent version that supposedly improves ergonomics

Cool, but not for my printer I'm afraid. "Overhang" works out poorly for her.

Mscichu wrote:

Can I ask for a shop contact in PW?

I checked a while ago and they don't have any more. As recently as yesterday there were over 120 in stock.

LA72 wrote:

Instead of PLA you could use PET-G.

I don't.

I have added a v2 fit from the other side of the filter.

khoam wrote:

Couldn't you install some kind of small led in this adapter that would start flashing and remind you to change the filter after e.g. 24h?

Too much luxury, someone else would envy me and steal it.

khoam wrote:

@piotr_go Couldn't you install some kind of small led in this adapter that would start flashing and remind you to change the filter after e.g. 24h? The counter would reset automatically when the adapter is removed and inserted.

Anyone here who has played "Metro" ? Clear association

khoam wrote:

Couldn't you have installed some small LED in this adapter, which would start flashing and remind you to change the filter after e.g. 24hrs?

Let's not, because if this LED started flashing (and you wouldn't have noticed, or just happened not to have the filter with you for the change) you could get a stone in your back (a lot of stones)....

Excellent idea. So let me, as a , "Super - Coronavirus Carrier"
I will spit, huff and puff at you, via this unmodified exhaust valve. Alternatively, this valve should also be fitted with an adapter for connecting a hoover hose with a nozzle equipped with an optical or laser sight. Because an ordinary rag mask protects in both directions , this one unfortunately in one. And we wrote so much about it on the Forum

@piotr_go This now reads..constructor

Based on the Italian experience of using airtight facial diving masks, we have today tried to assess for the first time with us their practical suitability and safety for the protection of Medical Personnel. We assessed vital signs in a rough manner: Heart rate, 02 saturation level and exhaled Co2 level Nurses after 10 and 20 min of operation with assessment of capillary blood gasometry after 20 min. ⚠️Vital parameters after 20min of operation were within normal range 😍 Technically: We 3D printed a connector to fit the mask's breathing hole and combined it with a 24-hour breathing filter for ventilators. The internal 2 rubber valves were removed.
The front exhalation opening of the mask with the valve left in place was sealed with an externally applied sticking film and plaster - Must be sealed! All connectors must be sealed! The nurse performed pump handling and squats to mimic physical exertion. Slight discomfort of breathlessness and heat was described. The mask maintained adherence and clarity sufficient for work. It would appear to be tighter than disposable masks. Thank you for the masks for testing Decathlon Poland Adrian Milewski. Thank you for the development of the 3D connector Lukasz Wisniewski. Thank you to Nurse Ewa Michalska for the effort for all of us. The filter from the M3 mask could also have been used. We are now waiting for the industrial printing of the connectors - thanks to DGS POLAND. We are looking for sponsors to purchase the materials. Results included in the video and photos😷. The use of the masks is left to the individual judgement of the staff and their own responsibility. It is not a certified medical product. Greetings⚕.
This was written by a doctor for your attention!

Krzysztof Kamienski wrote:

using sealed diving face masks

I happen to have such a mask.
1. Removing the internal valves is not necessary, it is actually harmful. When they are removed, the glass fogs up (I checked).
They are only there to prevent the exhaled air from flying directly into the eyes. For exhaled air there are additional ducts at the edges of the mask leading upwards. These are not obstructed by any valves.
So that as you wrote, "This was written by a doctor" not an engineer.
2. The top tube doesn't have any valves so I suspect it was just much easier to let the air go both ways through the same filters rather than trying to work out how to get valves in here.
I haven't tried it, but I suspect that after a while, when the filters have caught moisture, breathing will become SIGNIFICANTLY more difficult.
3. The adapter I've outlined doesn't interfere with the modifications you write about. If it suits someone, the valves can be removed and the outlet plugged.

Krzysztof Kamienski wrote:

I'll huff and puff at you, via this unmodified exhaust valve

Maybe off topic but what's the deal with the valve? I couldn't find anything on the internet about it. I was wondering about a bonnet e.g. M3 7502 with a round P3 filter. There, the exhaust valve is not on top like in the mask of the author of this topic. In addition, such masks are designed for harmful substances, and if something were to enter through the exhaust valve, it would quickly harm the person wearing the mask.

@tomek_byd How much can you write !!! The point is. to filter the air exhaled too. If you are infected, you spit up these viruses with every breath.

Krzysztof Kamienski wrote:

@tomek_byd How much can you write !!! The point is. to filter the air exhaled too. If you are infected, you spit up these viruses with every breath.

I just couldn't find anywhere what this was about. I understood from this statement that the other way this valve does not protect. As much as I agree that towards the environment there is no protection from the mask holder. Of course, there are different situations and someone can be in very long isolation and can be sure that they are healthy and then only need to protect themselves. From what I can see these masks have rubber valves on the inlet and outlet, if you block the outlet one and remove the inlet one you then breathe both ways through the filter?

@tomek_byd Yes, and then it is the equivalent of a normal surgical mask.

Krzysztof Kamienski wrote:

@tomek_byd Yes, and then it is the equivalent of an ordinary surgical mask.

A normal surgical mask has problems with tightness and length of use. They can only be worn for 2h although I have read that it is even shorter. In addition, they are almost unavailable and come at extremely high prices. It is also unclear what layers they have and whether they definitely meet FFP3 standards. They are simply sold separately from larger packs and there is no labelling.
A mask such as the M3 7502, for example, adheres perfectly. They are still reasonably available and the prices are not that outrageous. You can see immediately from the filters what standards they theoretically meet. Unfortunately, this exhaust valve is problematic.
Unfortunately, in these difficult times you have to grab every opportunity to protect yourself and others. You just have to do it with your head, and unfortunately information is lacking.

Krzysztof Kamienski wrote:

Yes, and then it is the equivalent of a normal surgical mask.

No, a surgical mask is neither airtight nor filtering. It is only there to keep you from spitting on the patient.
Alternatively:

Quote:

- Why does the surgeon always operate in a mask?
- So as not to lick the scalpel.

These 3M's are sealed and the filtering depends on the filter used.
There are original FFFP3s for it, but they are quite expensive and poorly available.

Hello I am a paramedic . Where can I get such adapters because my colleagues and I have such masks 3m which we bought ourselves but recently the prices of filters have been so exorbitant that it is a pity to talk . I would be grateful for information

Drzewo8383 wrote:

Where can you get such adapters because my colleagues and I have such masks

Look for someone with a 3D printer in your area, or state what city you are from, maybe someone will come forward.

City of Przedbórz Łódzkie Voivodeship

Is there anyone who could print one set of such adapters for me?
Przedbórz woj. Łódzkie

Drzewo8383 wrote:

Is there anyone who could print one set of such adapters for me?

I won't be able to make it, I've run out of PLA. I've ordered myself some PET-G, but it won't be in until next week.

Look for someone in your area: https://rk8dl.glideapp.io/

I print to health related people and I would say that the quickest way is to write an email introducing yourself and write what mask you need adapters for. It's also a good idea to write where you work (I then have to exchange emails so that I don't print to the jerks from the construction industry) and leave a phone number (I drive around town and then distribute the adapters).

If you need help with printing, I can help as much as my PRUSA can handle if you need anything, please send me a message on PW.