Ventilator - From Ender 3 Mainboard

thingiverse

This is a Work In Progress, and isn't tested, so use or print at your own risk. The following ventilator design is based on a BVM (Manual Bag Mask Valve) breather device that has already proven to be effective for manual respiration. This project simplifies the operation of the BVM with mostly printed parts in constant motion. If you're operating in an area where there aren't enough ventilators to meet demand, and you are manually operating a BVM for a family member, this design is specifically made for your situation. In addition to the printed parts, the build requires: 10K potentiometer NEMA 17 Stepper Motor 2 X 623ZZ Bearings 5 X M3-12 hex bolts 1 X M3-6 hex bolt 1 X M3 nut 1 Arduino (a sanguino was used in this example) 1 A4988 motor controller assorted wiring A repurposed motherboard from an Ender3, which is based on a sanguino with an A4988 motor controller, was utilized for the build. Arduino code is included, allowing you to determine the pinout requirements from the comments within the code. Adjust the motor driver to provide 1v (1000mv) so the NEMA17 stepper has sufficient torque to reliably pump the machine. It will get hot but stay within operational parameters. Once the design is completed, a build video and some images will be posted.