PAPR - Positive Air Pressure Respirator

thingiverse

MAJOR UPDATE: I've added an option to the back lid that makes it possible to eliminate the hose, external blower, and power supply by integrating them onto the rear deck. Currently, I'm using a USB power pack stuck to the lid with velcro, but when parts arrive, I will build in a battery pack. UPDATE: I've replaced all the original parts with remixed versions from the original CAD files (thanks to Widget for sharing!). The skirt retainer has been broken down into three separate parts to eliminate the need for supports. A curved bit features a brim to help it stay stuck to the build plate during printing, but it can be easily removed after printing is complete. Minor update: I replaced the fan cover because it reduced airflow too much, and now I have one that includes a plenum chamber which helps improve airflow. PAPR - Positive Air Pressure Respirator. Wearing any cloth mask can become exhausting after a while, especially with facial hair like mine, which makes those masks less effective anyway. Plus, as someone who uses Face ID on their phone, it won't work with a mask on. This design, however, (mostly) works even with a mask in place and also prevents fogging your glasses. I had this brilliant idea one day, but many other people got there first. This is largely a remix of https://www.thingiverse.com/thing:4292619 Read more about the project here: http://www.hygieiapapr.com It's a remix because I needed to cut it in half to fit on my Ender 3 printer. I added some alignment bits for when the parts are put back together, but that one joint really needs glue to get an air seal. The skirt retainer (chin clip and side rails) is my own addition, which allows a disposable shower cap to be used as a face skirt to help contain airflow. With this design, no glue or tape is needed to attach the skirt to the frame, making it easier to install and replace when necessary. The blower nozzle is also my own creation. Originally, I hacked out the design from primitives in TinkerCAD, but I was granted access to the original CAD files and learned a lot about Fusion 360 while improving my submissions. I used the blower from an inflatable Godzilla Halloween costume. Replacement blowers can be found on Amazon for $10-$15 or probably AliExpress for $3. I also designed the belt clip for it, and the battery pack is easy to slip into a pocket. There are several projects on Thingiverse that adapt the blowers. I printed https://www.thingiverse.com/thing:4253460 which uses cotton rounds as filters. This project requires a CPAP hose, a clear binder cover, the blower, batteries, and other parts. Most of the parts were printed with 3 walls at .24 layer height, no infill. I used an Ender 3 printer with cheap PLA material. The lid bits were a bit tough to print, and the thin profile got knocked around a bit at the upper layers and fell off the build platform. Eventually, I used a brim for a successful print. Experimenting with z-hop might also help. I was able to combine the front parts into a single print as well as the lids and 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. Printing with 3 walls works fine.