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I tried again in ABS, increased the hot end tempreature from 230 to 245, and bed from 110 to 115 and set speed to 30 mm/s, to try to reduce warping and cracks, and downscaled by 0.7 factor. In Cura I selected both support and raft, and the estimated printing time was about 10 hours.
In general it is printing well, however, the back teeth of the upper mandible were kick away by the hotend, because warping lifted the back ends, but printing continued with some speguetti that I'll be able to clean up afterwards.
I see that the support material added by Cura is not working as well as it should. I see that the voronoi version ( http://www.thingiverse.com/thing:518748 ) has some "organic" pillars (not vertical but tilted) that work very well, and teeth remain where they are supposed to be. Anybody knows if there is a tool to add this type of supports instead of of the "cartesian" supports from Cura?