Objekts not round

Vertex 3D Printer
1

Hi. I am Minivip. New member.
I have restarted my Vertex 8400.
When I print a round objekt ( about diameter 80 mm), I will get an objekt with about 15 edges.
What am I doing wrong. Please help me.

2

@Minivip

Can you send a picture of your 3D print

Best Regads,
Velleman Support