Safe 3d printable oxygen splitter

grabcad

My objective with this design was not to rely on the airtightness of a 3d printed component and in particular to avoid exposing ABS to pure oxygen, as it its not a polymer rated for use in a pure oxygen and many 3d printed parts do not seal air tight - causing a leak of pure oxygen, a major fire hazard. If a 3d printed part must be 'gas wetted', it should at least by a as small a part as possible and able to be sealed using acetone/varnish/glue etc. This device needs to be used with a T or Y fitting. these are very common, so preferably an off the shelf, safe component is available. if not, one can be 3d printed. Sean Buxton's design (Custom Bleed Valve and Flow Splitter ) is perfectly usable independent, 3d printable T piece. Anton Alveflo's is also very good, using less material and not as reliant on support or a well tuned printer (OxygenRegulator) Note that most of the 'T's submitted as entries look quite difficult to 3d print, they may require support to hold the shape or a very well tuned printer yet it is almost impossible to remove the support from inside them! If they're printed on an FDM machine 'in the field' without support, the top surface may be porous as the printer may not be well tuned. This design also avoids a potential issue with many of the submitted designs, in that the two flows are not independently adjustable, as that could be misleading for users. Oxygen flow regulators try to maintain the same flow rate, regardless of downstream restrictions. They're not great at it, but if both outlets/sides are set to a 50% setting, many people would assume each side would get half the flow rate they had when both were on a 100% setting. In reality the flow wouldn't change much, as the supply side regulator would try to compensate. This design overcomes that by only allowing you to set 100% on one side at a time, the 'total' can never be more than 100%.. This design has gone through numerous iterations to improve the usability and ergonomics. There are no comfortable finger grip features on the rear, detents between settings and an indicator to clearly show which side is getting the flow, and where maximum is. This design was created as part of my work for Field Ready but has not yet been tested in the field.