I really like kwmachine's hinges (https://www.thingiverse.com/thing:2992753) except his stackable gate hinge does not work for me. I always print the hinges in TPU for durability and the double just folds over from the stress of a second gate. I redesigned the hinge to allow metal EMT conduit to go through the hinge as a support for a double or triple ladder. Due to its relatively small height, I see no reason to print single and double hinges since there is no drawback to having all doubles... also allows a flag to be installed on a gate.

3 walls and 20% infill TPU is what my chapter uses and have only had 1 or 2 break after well over a year of use and lots of sitting outside and deteriorating.

For 1" PVC.