Round Cartridge to 3M Adapter - Respirator
Description
This allows you to keep using your old style round cartridge using respirators. Those round style are getting harder and harder to find and all but impossible right now. This allows you to adapter your mask to fit modern 3M oval cartridges which are much cheaper and more effective anyway. It prints in two parts, the little retention stem can be super glued on, and it keeps the rubber valve in place. They have been separated to make printing easier for most. You can take the rubber valve right off the previous setup and put it on this, or buy a new one. I've also included an adapter that will let you use a 3M P95/N95 cotton filters with your respirator without the need for a full vapor filter cartridge. Since with this covid-19 situation, vapor filtering isn't the issue. You will need the 3M clear covers they are super cheap a couple bucks, I don't recommend printing these, as printed ones are very difficult to remove, and very cheap to buy instead. I chose 0.1mm resolution as this is the recommended layer height to avoid the kinds of tiny gaps that could hurt the effectiveness of a printed part for a respirator. PRINT THE GASKET AND SEAL IN TPU (TWO OF EACH). Supports: For the Adapter file, you will need supports from the build plate and at the top for the filter lock tabs. The inside of the model does not need supports, save yourself cleanup and use a support blocker there. Also save yourself a headache and ONLY do supports around the hole opening for the 3M N95 filter file. The rest it prints perfectly fine with bridging. UPDATE: Design has been improved to make it stronger and fit the seals better. As well as make it easier to print. It's in two pieces that will need to be super glued together afterwards. The cross hatch part with the nub goes facing inside the mask, if you do it backwards no air will flow. Do not glue that side...the sides you glue together are the ones facing the print bed. I will post Updated pics soon. UPDATED: The seal has been made thinner to make it easier to use. If you find it is too thin for you you can make it 0.25mm thicker or visa versa. It's only a small disk, very easy to modify.
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