flat surface for final result

[foxxey 0]

I send a tiny 3d onbj jst to do a check on my 3d printer (Ultimaker O+)  and it printed a surface of it. The nozzle is new and from previous attempts to print everytime I have the same problem...this is the reason I bought new nozzle. The PLA material was stacked inside the nozzle because  it didn't stack on the bed while it was printing and I had to change nozzle and some other parts from the printing head.

Any idea?

I have this machine for 1 year and I still didn't manage to print anything.