large print not sticking

[Rockface]

Hi does anyone know what is causing this.
The dimensions are 200mm x 200mm
I have a glass bed set to 65C and the extruder is at 190C
Everything was calibrated recently. (it did this before and after calibration)
The bed is level.
The glass bed is secured with double sided tape instead of clips but it did this when I used clips so I don't think that is the issue
ender 3 v2 SE

The printer works fine on prints where the footprint is smaller.

I am currently unable to insert an img ??
I tried

[img]path to file[/img]

and nothing happened

 

[Rockface]

I did some large prints creating my solar panel mounts. On my early prints, the large flat bases would ripple from not adhering properly.

To fix it, I had to get the z level bang on, over extrude the first layer by 10% and do it really slow.

This was PETG though.

Thanks. I appreciate lack of pics doesn't help. Not sure why I can't upload pics but your description sounds exactly like what mine is doing. I'll give it a try.

 

[Rockface]

just out of curiosity, the instructions say set the bed to 50C but if I'm using glass that is stuck with thin double sided tape does it need to be hotter ?

 

[Rockface]

PLA. I don’t think it’s related to the bed. I’ve just redone the print with a raft which stuck perfectly. The base layer of the object then did exactly the same thing. I’m wondering if it’s a fan issue. I’ll tinker some more with settings tomorrow when the girlfriends patience meter has refilled.