This beautiful curved model by virtox had proved extremely tricky to print for various reasons. My best attempt had been in black ABS and although the print completed successfully (unlike several earlier attempts) it cracked in several places whilst it was still printing. This, more than any other, was the model that prompted me to build a heated chamber for the Mendel90.
Here is the print, lying on its side, showing the cracks that appeared as the plastic cooled and shrank causing delamination.
This copy was printed in natural ABS inside the heated chamber at 35 C and, as you can see in the picture, the surface is smooth and blemish free.
And here are the two prints side by side.