Simple splitter and pinch designs are easy to print and durable.No leaks through this design. Controlled the flow of O2 for both patients. Fit with nasal cannulas provided.

Cost: 4
Printability: 6
Functionality: 10

Excellent way to avoid leaks. Compatible with the nasal cannulas provided. Proved to be a very applicable and effective. No leaks were found, and screw design and provides precise control.

Cost: 3
Printability: 6
Functionality: 8

Quick and easy to print, lean use of ABS, while still being durable. Marvelously simple and functional with no leakage.

Cost: 5
Printability: 6
Functionality: 6

Single piece requires no assembly, is quick and easy to print, and holes in baseplate reduce substrate needed. Easy to scale to needed tube size. Some concern about ability to secure tubing and ability to control flow.

Cost: 6
Printability: 5
Functionality: 4

Simple design and durable design but had some bed adhesion in the printing. Splitter effective, but inserts don't fit easily, and require unhooking line to change. Only problem was changing the flow of O2.

Cost: 5
Printability: 5
Functionality: 4

Easy to print, and thick walls provide the sturdiest externally-tapped splitter design printed. Uses ""bleeding"" method to control flow rate, and this unfortunately tends to waste oxygen. Not the best solution in a resource-limited environment. Takes 20 mins to print the appropriate bleeder.

Cost: 4
Printability: 6
Functionality: 4

Clever design that makes use of constricting tubes to control flow of O2. Easy to print and durable and the splitting function works well. We are concerned material may not be flexible enough, however.

Cost: 4
Printability: 5
Functionality: 3

Simple, one part design that would be relatively easy to print. Would be low-cost and user friendly. However, would have liked to have seen the designer design a splitting function of his own, rather than suggesting use of someone else's.

Cost: 6
Printability: 4
Functionality: 2

This simple and elegant design offers an effective way to control the flow of O2. There is some concern about where the piece would be placed while in use – would either dangle heavily between patients, pulling the O2 tubing towards the common center of gravity, or would require a second object to support it - but should perform both functions correctly. Additionally, thin vertical tubes did not print well.

Cost: 4
Printability: 3
Functionality: 4

Splitter offers good airflow. Throttle valve part not sized well and threads don't print well, however.

Cost: 3
Printability: 5
Functionality: 2

Great use of valves in controlling the flow of O2.

Interesting and tight fitting design from Imprenta3D. Assembly video was a nice touch.

Tube fitting design seemed compatible. Testing needed to ensure that it will not leak. Great job overall.

Unique one part design with constricted tubes to control flow. No leakage.

Great tube constricting design from Terry, with no support material required.

This design did a good job using screws to constrict tubes and insured no leaks.