Z banding and the oscillation problem

[gpau]

Hi,
I can not get on the Z banding and the oscillation problem, I checked, and here everything is in order.
What can be done to eliminate it?
Thank you

[bang]

Check this post:
http://www.geeetech.com/forum/viewtopic ... 13&t=17834

[gpau]

how do I make the right measurement of the piece?
I tried to print it but it's too big, I use simplify3D

[bang]

Maybe you can try printing the first layer to check the size?