Not a perfect first layer

[Simone]

What could be the couse?
Over extrustion of the first layer?
or the hot-and is too squished to the plate?
im using an 0.5 mm extruder

[oliof]

yeah I would think you are too close to the bed and you may be printing too cold.

[infiniteloop]

@Simone

Over extrustion of the first layer?
or the hot-and is too squished to the plate?

Difficult to decide from the photo, but in the rear left, it even looks like there a marks of under extrusion. The oozing might indicate uneven extrusion, which could possibly be influenced by the squishing you mention. Test this by varying the initial nozzle height via microsteps on the fly.

Further potential causes of oozing are the extruder’s temperature (often a tad too high, sometimes too low) and filament quality - possibly, it has torn some humidity?

[cosmowave]

@Simone Eventually you have a high "first layer extrusion factor" ?