This may sound weird but Im having trouble with the 3rd layer adhesion on most of my prints lately. See the attached pics for more info. This is 3mm PLA
The 3rd layer seems to lift off the 2nd in some areas. Is this a temp issue? My preheat temps are 195 for the hot end and 70 for the bed. Printing temps are 195 and 65. Could that 5 degree difference cause this? The other difference in my printing lately is that im not waiting for the heatbed to warm up for 5min like I used to. Could that cause it?