This could also be caused by retraction settings, try running with no retraction at all, at least you can eliminate this a s the problem if there is no change on your calibration print.
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As all previous comments I agree that it is very likely an extrusion problem. The extruder is either pulsating or you try to push the extrusion too hard. I.e. Print slower and see if that helps. Of course you can try other pla plastics that are more friendlier to extrude. Especialy light colors like white give better results and require less extreme temperatures. White extrudes nice at 190 while black requires higher temp like 210 degrees celcius at 40 mm/s printing speed. Cura has a nice feature that allows you to tune the extrusion (extrusion percentage).
Good luck with trying all the suggested comments, i am sure you quickly find the problem and let us know what it was.
No, that’s very odd. I’d be interested to hear what others have to say.
It may be simple. The first thing I thought of is the bed may not bed level and/or the nozzle is not quite close enough to the bed. I’m sure you’ve already checked that though. 
Good luck!
-Michelle
If it were an extrusion problem, this would happen if your seams were lined up (each layer starts in the same place), but would not appear to be so regular if each layer started in a random location. In the pictured print, does each layer start in the same location? If so, try another print with randomized start points, so you can isolate the cause.
Bpetno
12
I have had very similar issues. Your problem is either 1) Your extruder is not firmly held in place so as it moves throughout your print the head will tend to wobble and move around. 2) Your belts are not tight enough resulting in lash which can and will cause things like I see in your picture to happen. 3) Your z axis rods are misaligned. You can check this by moving the z axis up and down and visually seeing if your y axis wobbles as it goes up and down. This is unlikely, as it would not cause the pattern I see in your photos…Trust me, this is not an extrusion problem. It is a problem with alignment and tightness throughout your printer
Bpetno
13
Also, your belts may be already tight. Check the fasteners that hold the belts to the carriages. One of these may be loose causing excess lash
I just dealt with this on a solidoodle 3 (direct drive extruder). It was a failing extruder stepper driver. I replaced it and the pulsing went away.
To be honest your extrusion looks not bad Are the parts well bonded If your having extruder problems other things typically go wrong this is very consistent I had said to check your belts I am sorry for the double post But your bearings could be warn or loose in there mounts
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CLau
16
Adjust your X and Y motor pots on your board. This happens when your motors are pulsing from the lack of current, giving you the “moire” effect. *edit* Down voted for no reason. Guess I won’t give any advice here anymore
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Brad_3
17
Have you adjusted the nozzle temp? I’ve been able to fix a lot of my issues like this just by raising the print temp up. Just out of curiosity, is that ABS?
MB3D
18
The issue seems to appear along the outline of extrusion, there is no retraction at each 5mm of the outline, i think.
I would first check the extruder and make sure it is snug.
raising the temp make is even more pronounced. The part was printed in PLA but this also happens with ABS. The only filament it doesn’t happen with is ninjaFlex. I believe that is so because of the unique way ninjaFlex behave while its being extruded, in that the it creates a little pressure as its being melted and then extruded
I didn’t want to have to buy stepper drivers, but i might have to
I have done all of the things you mentioned. I will recheck the tightness of the printer. Honestly i think its a micro stepping issue, but i really don’t know much about it and haven’t been able to find much info through google searches
I wish it was that simple. I have already made sure the bed is level and properly calibrated.
Thanks!!!
This was a calibration print. I set a print speed of 40 mm/s but it slows down to about 10 mm/s if the layer print time is below 30 sec. Also I can adjust the extrusion percentage lower but the i have a problem where the walls would be to thin and not printed at the desired thickness. I will keep trying
Thanks for you suggestions
