Quote Originally Posted by curious aardvark View Post
wel one thing I can say - you'll get better results with the same material in different colours than different materials.

Given that pla sticks to cold beds and abs to hot beds - don't mix the two. No matter what settings you use one or the other won't stick !
Not necessarily, I have PLA that does require a heated bed, no less than 75c for some. I've never really needed more than 2 shells either, even on hollow models.