Object dragged by the extruder

[Shevaara]

Hi everyone,
I just bought the geetech A10 3d printer and I'm pretty new to this, but I have some problem printing.

I did the test dog and it comes out well. I printed also two other stuff and everything was ok.
Then it started to drag the object on the plate. I thought about a problem with the extruder, so I cleaned everything until the PLA come out well and clean.
I re-adjusted the corner's level and started to print again. After a while (about the 5%) the extruder started to drag the PLA, I cleaned everything, tried again and happens again
As you can see the base is a bit detached from the plate, but only by one side, what's wrong? The plate is too hot and deformed the PLA?

[wotor]

It looks like not good bed adhesion.
You need set correct first layer height and level bed. It could be caused by warped bed as well.
What temperature bed is while you print?
Clean bed with isopropyl rubbing alcohol. If this not going to work try glue stick.

[Shevaara]

I'm printing at 50°c bed temperature.
I use the suggested setting for the slicing given by geetech, so the first level should be correct. I also printed other stuff before, I don't get it

[wotor]

So it's not temperature problem.
Move extruder nozzle in Z0 position and try fit piece of paper between bed and nozzle. If it is set correctly, should be tight fit.

[Shevaara]

I did it both manually and with levels corners, everything seems ok.
It's just the raft/ brim (i don't really know the difference) that detach. Print without raft/brim could help, but it's not the solution

[wotor]

I really don't use rafts. I know there is quite a few settings regarding rafts in Cura. Maybe some else can help you with setting them correctly.
I've used brims in the past and had no problems with it.
If your Z offset is ok, then maybe you have warped bed.