Using a dry erase pen, I marked two sides of my first calibration cube and then wiped off the surface with my fingers. I did this to help bring contrast to the pattern on the cube surfaces.
What is wrong with having this type of surface? Is this significant?
It doesn’t bother me yet, but it may depending on the parts use.
I’m afraid I’m going to need a little bit more clarification before I can fully understand what "pattern"ing you’re talking about? The layer lines? That’s just a fact of 3D printing.
@ThantiK That is exactly what I was thinking - just normal inherent texture due to the process. However, some folks with more experience than I thought these bands were a bit larger than the norm. This is a 20mm cubed tube with a 3.8mm wall. To me it feels nice and even and I don’t see an interference pattern myself.
It’s as good an any MB-R2 part that I’ve printed at the library at any rate.
It can highlight issues like overshoot if the texture seems more uneven on the Y faces than the X faces. Also you can compare results between filaments, because some extrude more consistently than others. Apparent print quality is affected by how consistent the width and placement of perimeters is between layers, and this looks like a good way to highlight problems.
Some people prefer “fat layers” where the layer height is closer to the diameter of the nozzle and some people prefer “thin layers” where the layers are less than half the size of the diameter of the nozzle. The thin layers will probably show less of that texture. Putting up the temperature some can probably also get rid of the texture, but comes at a price. Mind you, I am not nearly as experienced and have only been printing periodically since about August.
It does not look like you distributed the ink smudge very well, but the clarity of the picture was good enough that I can say this looks perfectly fine to my less trained eyes.
Sorry - forgot to calibrate my thumb. 
Actually, that’s just is the way it rubbed off. I did have it covered fairly completely and I didn’t want to use a permanent marker in case it was too wet. Permanent markers seem to color PLA quite well.
Giving it a few swipes over some sandpaper laid flat on the table will do the same thing, probably better than a thumb.
So I figured out what was actually being said with respect to the pattern on the sides. There seems to be a bit of vertical banding, giving the sides a bit of a checkerboard appearance. The current hypothesis is that the toothed belt undulates as it passes over the smooth idler pulley on the tensioner side. It seems sufficiently slight to be of little worry to me at this time.
The post explaining it a bit better than I did:
https://plus.google.com/102831253296337169949/posts/Whkq3AcPTgV
