Weird Lines on Print

[Daniel.Ortiz 0]

For some reason I keep getting weird lines on my prints whenever the model has any sort of non-smooth surface. I can’t explain it well in words so I hope the pictures I’ve posted help. 
anything to help solve this issue would be a big help.

 

Thanks!

[TR33C3 0]

Following because I have this happen as well, seemingly randomly. My guess is random over extrusion or under extrusion since it's a solid line around the whole object. Hopefully someone with dónde real answers will pop in. 

[Smithy 1,145]

Could be over- under extrusion, but I would assume it is a hardware issue. Check your X,Y and Z axles if there is play, tighten all the belts, check your Z screw and clean it.

[Framar 38]

+1 for Smithy comment. I would suggest you perform a X & Y axis calibration. Also I had this kind of result from a partially clogged nozzle.