This is a skeleton I found on Grabcad by Marco Valenzuela (not for commercial use, free to print). I remixed it (though I have posted the entire skeleton too) so you can print it and glue the parts together (as I did). The limbs are meant to bp printed vertically, thorax orizontally leaning on its back (the back part) and on its front (anterior part), I printed the head leaning on the occipital bone.
I always use raft. Support was needed for all the parts except the limbs.
Layer 0.2mm, speed 150mm/s travel , 90mm/s print, 10% infill, pla

ADD: rescale 4000%

note: 2* image from gallery is the model painted with XTC-3D

ADD-ON: I uploaded a set of Lungs, heart, liver, bowel and stomach fitting perfectly for Skelly (to be printed with Ninjaflex flexible filament 10% infill, 30 mm/s, 220 *C)

Thanks to @Lambchops and @markpearson for their organ models
Heart, bowel and stomach are my own designs