As most or even all of the pros know, if you are printing W ABS,

then you might want to close the insides of your 3D printer (if it's not yet then do so

) because if you start printing and the bottom is colder then the one on top, the bottom one may then shrivel and un-stick from the top one and ruin your
BIG BEAUTIFUL MASTERPIECE THAT WAS PRINTING FOR MORE THAN AN HOUR!!! 