Is this due to Z wobble? (no replies)

Hi everyone.

I've run into some problems with banding on my Makerfarm Prusa i3.



The above image was a print of the Gameclip (http://www.thingiverse.com/thing:43977), and I realized there was a lot of banding on the Z axis which I didn't notice much before. Also, the whole print is on a very slight lean.

So I printed a calibration cube (hollow) and noticed this:





Sorry about the delamination, that's because I pulled it off the bed and the bottom stuck.

For both prints I was using white PLA from diamondage (3 +-0.06 mm) at 190 degrees (all layers) and the bed was set to 60 degrees for the Gameclip and off for the cube. The slicer used was KISSlicer with the following settings:

Extrusion and infil extrusion width: 0.6mm (measured)
Skin thickness: 0.8mm
Layer thickness 0.2mm
Infil: 20% octagonal for the Gameclip, off for the cube
Support: off
Filament diamter: 3mm
Flow tweak:1
Z-lift: off
Destring: [default]

Bed roughness: 0mm
Z-settle: 0.25mm
Z-offset: 0mm

Firmware type: 5D - Absolute

Loop speed: 17.5mm/s
Solid speed: 38.75mm/s
Sparse speed: 42.5mm/s

As for the printer itself, the M5 rods appear to be straight, and a flexible tube is being used as the coupler.

Any help and suggestions will be greatly appreciated