PAPR - Positive Air Pressure Respirator

thingiverse

MAJOR UPDATE: I've added an option to the back lid. This version gets rid of the hose, external blower and power supply, and integrates all that onto the rear deck. Right now, I've just got a USB power pack stuck to the lid with velcro, but when parts arrive, I will be building in a battery pack. UPDATE: I've replaced all the parts with remixed versions from the original CAD files (THANKS Widget!) The skirt retainer has been broken into 3 parts to eliminate the need for supports. The curved bit has a bit of a brim to help it stay stuck to the build plate during printing, but it can be easily removed. I recommend gluing the parts together after printing. (minor update: The fan cover reduced airflow too much and has been replaced with one including a plenum chamber that helps.) PAPR - Positive Air Pressure Respirator. Breathing through any cloth mask can become tiring after awhile. Plus, as a man with facial hair, those masks are really not doing much good anyway. On top of that, does your phone do Face ID? Not with a mask on. But it will (mostly) work with this. Bonus, no fogging your glasses. I had this brilliant idea one day, but naturally, lots of other people got there first. This is mostly a re-mix of https://www.thingiverse.com/thing:4292619 Read about the whole project here: http://www.hygieiapapr.com It’s a remix because I had to cut it in half to fit on my Ender 3. I added some alignment bits for when the parts are put back together, but really, that one joint needs glue to get an air seal. The skirt retainer (chin clip and side rails) is my own addition. It allows a disposable shower cap to be used as a face skirt to help contain the airflow. With the retainer, no glue or tape is needed to attach the skirt to the frame, and is easier to install as well. It makes it easier to replace the skirt and face shield when no glue is used. The blower nozzle is also my addition. Originally hacked out of primitives in TinkerCAD, I was granted use of the original CAD files and learned a lot of Fusion 360 to improve my original submissions. I used the blower from an inflatable Godzilla Halloween costume. (No, not the T-Rex, but they’re all the same) Replacement blowers can be found on Amazon for $10-$15, or probably AliExpress for $3. I also made the belt clip for it. The battery pack can just slip into a pocket. There are several projects on Thingiverse to adapt the blowers. I printed https://www.thingiverse.com/thing:4253460 which uses cotton rounds as filters. It also needs a CPAP hose, a clear binder cover, The blower, batteries, etc. Most parts printed with 3 walls at .24 layer height, no infill. Printed on an Ender 3 in cheap PLA. The lid bits were a bit tough to print and the thin profile gets knocked around a bit at the upper layers and got knocked off the build platform. I eventually used a brim for a successful print. Experimenting with z-hop might also help. I was able to combine the front bits into a single print, as well as the lids, and the skirt retainers. (NOTE: I originally tried printing with 4 walls at .28, but the slicer introduced a weak spot where the top and chin connect. 3 walls works fine.)