I'm not speaking from experience in printing with PC/ABS but would also be on guard for more warpage (more heat, takes longer to give up that heat) and especially if you printing sections with higher percentages of fill.  A part printed with 100% fill would likely retain far more heat for a longer period of time than one printed at 30%.

I would agree that the aluminum bed needs a higher temperature than your 70 deg/C but would defer to "elmoret" to the actual temp that works.  As long as your bed temp is so low, it just becomes a heat sink - pulling the temperature out of the filament causing it to solidify again and that probably decreases the ability to stick to the aluminum at all.  I see this thread is a bit older but would be interested to learn what others might have found that works for the PC/ABS filament and the temp settings that work well.  Thanks.

Thanks!

I am trying to print different Polycarbonate grades and facing some problems. The Polycarbonate show a lot of shrinkage while cooling down. So the printing part (tensile bar) comes off from the heating bed after 3-4 layers. I am currently using 70 degree C heating bed temperature. I will be using aluminum bed with temperature of around 150 degree C. Will this work to adhere Polycarbonate? I have tried hairspray and ABS solution.. nothing works

Please give me suggestions and let me know if anyone has worked with Polycarbonate.

Thanks!