Appreciate "Axel Johansson" did the "Strength test" at this design.

Check the film on youtube
https://www.youtube.com/watch?v=WayVij-MZDE

Here's the info of the film and the test result

Measuring of the maximum force the carabiner "Strong Flex door Carabiner" from thingiverse can handle.
Measured maximum force: 236 N
The carabiner is printed in ABS.
The design is Charlie1982's:
http://www.thingiverse.com/thing:489709

Infill: 100%
layer height: 0.15 mm
Temperature: 245 °C
Total print time: 1:22 h

Thousands of thanks Axel did the test and sharing the result :D

Carabiner is very useful to me, I make the design by 3D print can let the door feel like spring inside.
The design can print without support and raft.
Layer high from 0.15mm~0.3mm is fine.
Infill better to use over 70%.
Here is the video link: http://youtu.be/f-gohLbARMo
Hope you will like it ;)