Awesome design by 7Fish. Very time intensive to build, but worth it.
Used Prusa PLA filaments: metallic green for the body, black for the eye, golden for the iris and tail, red for tongue.
As mentioned in the design's page, sand the top and bottom of the ball joints, because otherwise they are nearly impossible to snap together (this is a very gruelling task). If you intend to print this, print a few test pieces; I recommend the first and second tail set to test the working joints (you hardly can move them unless you got between 5 and 10 of them connected), and also the last ones, to test how the smaller joints behave, if they break or not for the size you chose.
Printed this on 100% scale, but I don't recommend it. The ball and socket connections get way too small by the end of the tail, and instead of rotating, they break if you try to change their position. The bigger ones work perfectly, though.