Quote Originally Posted by organotis View Post
Hello,
I have a prusa i3 pro b from geeetech. I have some quality problems with it.
You sound surprised! I have a very low opinion of Geeetech quality.

With that said... Those prints are not that bad. It looks to me like it is under extruding at times. It could be an occasionally plugged nozzle. But I think it is more likely the extruder stepper motor is under powered. (Geeetech does put low torque stepper motors on the printers I've seen.) Can you turn the power up to the stepper motor?

One test to confirm this theory is try printing that same object but with the nozzle temperature 10 degrees higher. The print will look bad. But if you aren't seen 'under extrusion' it is because at the higher temperature, the filament is easy to push through the nozzle.