While slicing, scale it up 300% or something because the file item is very small - just printed, joints work fine, just wait a little for it to cool as it is fragile. I used PLA filament with 2 walls and 20% infill. No supports needed.
This is my creation on Tinkercad, fmy irst time trying to make an articulated thingy. This is my model here, https://www.tinkercad.com/things/dKOaGbD4iqu-articulated-test - I'm not sure if that link works.