Try 205c, 40 speed, 40-60c bed, fan 100% after 2nd layer. Are your temps fluctuating by more than 1-2c? How have you been storing your PLA? Ambient humidity? Would suggest trying to print something like 4 at a time to make sure the pieces cool before the next layer gets slapped on.
Make sure bed is covered in a light spray of hair spray for PLA if you want to print direct to the glass. Works flawlessly on my 4S.
Also may want to check out Jetguy on wanhao’s forums on google – fair warning, he’s a little irritable but he’s awesome too! Redirecting to Google Groups 1
I had the same problem printing my first marvin with the back side layer adhesion. I tried it again with a slower speed and it worked fine, hope this helps!
Checked the temp and it is fluctuating 3-4c, seems to be a wekaness on the wanhao i3 v2, alot of people have same issue. Found a fix for it and will do it this weekend along with some other upgrades.
Dear, it is always true: price=quality=service . If you are interested in good quality 3d printer, I can recommend you JGAURORA 3d printer at below Aliexpress online store : http://www.aliexpress.com/store/1759640
If you can sell it for same price I may consider