I used Kwmachine's gate hinge as a guide to build this hinge.
We wanted to replace using PVC T junctions as the original hinge was very convenient. This allow you to put another gate or pole above the ground level gate. (vertical double gate)
And when i was building the last one (32mm) i realized that i didnt need to model the short part, just the modified tall part. How much time i could have saved, oh well it was good practice.
We were finding 1/2" PVC pipe but we were finding its too flimsy,
i have not yet printed any other sizes to test, but they look like they should slice ok (i sliced in cura to check for problems)
50 = 1/2"
75 = 3/4"
1 = 1"
The spine along the vertical portion was reinforced and held up well to several hits, both directly and indirectly (when someone hit the pole well above the hinge)
I used sainsmart TPU to print these with 6 walls and 50% concentric 3d infill (cura)