Second try succeeded! I finally got a nice part after a print that took 43hours. The layers looks nice and even.
But yes, this time I broke the part. The part was sticking so good to the bed that I was forced to apply some extra force to make it release from the print bed. Making a quite big crack on the top surface, damn!
Always when a print have finished I wait a while to make the glass bed cool down to room temperature, this way it becomes so much easier to remove parts. In combination with that I also use a Buildtak Spatula trying to get one of the corner to lift on the 3D printed part, if one corner lifts the rest of the part will follow quite easy.
But for a first prototype for the Valify robot lawnmower this part will suffice. I will fix the crack with a soldering iron and some extra PETG plastic. This part will not be visible in the end so the aesthetic beauty is not so imported, even If nice parts is always to prefer.
Here is the assembly:
After a rough fix with the soldering iron the result looked like this: