A doctor friend mentioned a possible shortage of Y junctions for ventilator hoses especially if it became necessary to service multiple patients off of one machine (like so: [https://hackaday.com/2020/03/19/saving-4-patients-with-just-1-ventilator/](https://hackaday.com/2020/03/19/saving-4-patients-with-just-1-ventilator/)). Not knowing the precise dimensions of the tubing, I threw together a parametric OpenSCAD file that will accommodate most reasonable values. I recommend <90 degrees between branches to avoid support structures. The scad file ensures clearance for the lip by adjusting the branch length according to the split angle. Feel free to utilize or mod as needed. The STL is for a standard 22mm hose and 60 degree split, but this script will support other sizes too.

Safety considerations:
-Use at your own risk...something something neither liable nor responsible...something something...
-Untested on humans as of yet. Will update once that occurs.
-3D printed items can be porous and permeable
-Recommend checking the SDS of whatever you print for particulates and hazardous volatile compounds
-This will be an inferior/less desirable solution than similar parts from approved sources
-Pretend that you have COVID-19 when moving the part from the print bed to a sealed container for delivery
-I fly helicopters and ride motorcycles, so my perception of acceptable risk likely doesn't match yours or the FDA's.