ghast

Hi! Ive been trying to print this thing but when i press "Prepare to print!" this is what i get which is only the support material. Also when i try to print it it comes out like the second image :( Any suggestions? Thx

Hi! I made a test object with dimensions 100*100*100 mm but it seemed to be printed at 99*99*99 mm in real life after measuring. Any clue as to how to change this? thx