Emergency Respirator for Protesters: Plastic Bottle Edition
Description
v. 0.01 Background: ==== This design is motivated by Scotty from the Strange Parts YouTube Channel and his call to action to develop an open sourced, 3D printable gas mask for protesters. If you haven't watched his video, please go and check it out here https://youtu.be/ko77iRI9bek This respirator design is intended to contribute to the larger 'Open Source Gas Mask Project', by exploring a scaled back and easily printable, minimal viable product. Specifically, a carbon filter, emergency half face respirator, held against the face with one hand. This design is made from 3D printed parts, a 2L plastic soda bottle and other readily available materials. Critical Safety Notice and Considerations: ==== No claims are made about the effectiveness or efficacy of this design. Use of this design for any purpose is at the discretion of the user who holds all risk and responsibility. Commercially available and certified respirators and PPE will always be the appropriate option for any personal protection purpose. If this design is used, it should only be for emergency purposes, for as short a period of time as possible, and where no other form of protection is available. This is an early work in progress. Significant development is needed to refine the design and validate its effectiveness against respiratory agitating agents. Intended Function/ Design Intent: ==== This design is a half face respirator intended to be held against the face with one hand. The face side shape is under development and currently (as of v0.01) may need to be manually pinched around the nose to form an airtight seal depending on face shape. With a little bit of practice this can still be done quickly and consistently with one hand. The intended use of this respirator is to be kept readily accessible and applied when respiratory irritants are released into the environment, either to assist in immediate departure from the area, or to enable action to neutralise the source of irritant. As this respirator design only covers the mouth and nose, further protective equipment will be needed for the eyes. This is beyond the scope of this design, it is recommended that you conduct your own research. A pairing of swimming goggles and certified shatter resistant machinery glasses may be appropriate. While this design is intended to be manually held against the face, an alternative Filter Cartridge design has been included which provides anchor points on the filter for mounting straps or other hardware. This alternative design has been included to encourage customisation and further experimentation by the community. Testing: ==== Limited testing has been conducted on the respirator as of design v0.01. Test - Perfume: ---- *Setup*: Fully assembled respirator is placed against the face with one hand, with fingers pinched around the nose to assist forming an airtight seal around the face. Perfume is sprayed parallel and close to the filter end. This was repeated for 3 separate people. *Results*: No smell detected by 2 of the users. Slight smell detected by 1 user. This limited testing may be indicative of the filters ability to protect from respiratory irritants. Further testing will be required. Parts, Equipment and Print Settings : ==== * Recommended print material - PLA or PETG * Estimated total print time - 8.5 hrs * Estimated total material used - 65g Parts: ------- * Printed Part A: Filter Cartridge * Printed Part B: Filter Cap * 2L Plastic Soda Bottle (or equivalent large plastic bottle), keep the cap * Activated Carbon - Approximately 85g * Tape (Cloth or duct tape preferred, but any type of tape should be workable) * Cotton Balls or Pads * 3x M3 screws (can be between 10mm and 18mm in thread length) * 3x M3 nuts * Glue ('guerrilla glue' type recommended, but any glue or material able to form an airtight seal can be used) Equipment: ---- * Scissors * Permanent marker Print Settings: ----- * Nozzle diameter - 0.4mm * Layer height - 0.2mm * Wall line count - 10 * Infill - 40% * Shell top layer count - 10 (recommended) * Supports - none * All other settings - typical print settings Construction and Assembly: ==== * Reference pictures of key steps are included at the bottom of this page 1. Print *Part A- Filter Cartridge* and *Part B - Filter Cap* 2. Mark and cut the 2L plastic bottle along a straight horizontal line just above where it begins to taper on the cap end (please experiment with different shapes as you wish and share results) 3. Apply tape along the edge of the bottle to assist seal and comfort 4. Screw on the original bottle cap and test fit the bottle against your face to check for an airtight seal. Modify bottle as needed 5. When happy with the fit, apply glue to bottle threading and screw on Part A - Filter Cartridge. Leave to dry as required 6. Install M3 nuts and bolts on the Filter Cartridge 7. Insert cotton wadding and activated carbon into the Filter Cartridge and then close with *Part B - Filter Cap*. * To do this, first add a thin layer of cotton to the bottom of the Filter Cartridge, just enough to prevent activated carbon from falling through the filter. Then fill the Filter Cartridge with activated carbon until it almost reaches the M3 bolts (approximately 80g). Add another thin layer of cotton to prevent the carbon falling out of the front of the filter and close with Part B- Filter Cap What 'is Plastic Bottle Edition?': ==== The purpose of the label 'Plastic Bottle Edition' is to help differentiate this design from future designs and projects which may wish to use the common name of 'Emergency Respirator for Protesters'. This respirator design is intended to assist the larger project of developing an open source, 3D printable gas mask for protesters. To this point - on the off chance this design gains traction - I do not want it to overshadow future designs or project branches. If they wish, I encourage future projects to use the common title of 'Emergency Respirator for Protesters', but to assign a new version name to help differentiate design branches. Feedback and Collaboration: ==== I am very open to feedback and would greatly appreciate any help to further test and validate the respirator design. I will update the model and this page as suggestions come in. I may be open to direct collaboration, but I am not sure what that would look like at the moment. If you have any suggestions for collaboration methods please feel free to reach out, I would be happy to discuss. Fusion 360 .3fl File Notes: ==== The threading for this design was created using the PCO1881 thread profile created by terahurts which can be found on their thiniverse page https://www.thingiverse.com/thing:2693686. This design uses profile V3. The anchoring for the filter cartridge can be turned on and off by enabling/ disabling the feature group 'anchor'. Acknowledgements: ==== First and foremost, to all the brave people around the world taking to the streets to bring about change. If not me, who? If not now, when? Thank you to Scotty and the Strange Parts community for putting out the call for this project, I hope this will help towards your larger vision. terahurts for their PCO1881 thread profile. You're a champion! The whole 3d printer community. Our tenacity, and spirit of collaboration and innovation will move mountains. Big Soda, for spreading strong, cheap and airtight vessels to every corner of the globe. A backup mirror of the files and documentation be found on GitHub here https://github.com/notefields7486/Emergency-Carbon-Respirator-Bottle-Edition
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