I have a set in PLA that are doing great after a few days of playing with them.
I had to scale this up 155mm and situate it so it had multiple walls on all the hinges. Slic3r wanted to make the layer start where the item was thinnest, causing the thin hinge near the jaws to just be a series of blobs that would break immediately. Setting seam to be random, rather than aligned helped keep the hinges from becoming weak spots. It took some trial and error.
Bad, not enough walls:
Good, multiple walls: