This is layer 2 or 3. It will be covered by the next few layers but I feel like it shouldn't be this fugly. I'm using Cura's Standard Quality except for temp which is set to 205. The filament is Inland PLA.
I second z offset. Weird that this happens only at a certain regular "column". Could be hiding an underextruded strand on the level below. In that case your temp might not be stable.
z offset / nozzle height seems to be the thing. I've raised it up and it looks better. After that I played with the temp a bit and it seems to be happier around 210-215 though there is more stringing.
So far, all attempts at ironing have been a disaster, both zig zag and concentric. I'm going to continue dialing in the z offset and temp before ironing.
Yeah, that looks much better. Do you have a self leveling bed? If your bed has a high point that is not captured in its measurements its possible that your still getting just a bit more drag in that specific spot.
One thing you can do to test, is to move the print to a different spot on the bed in your slicer.
I second running a temp tower. Your first layer may be a little too low, but you're probably over extruding since it looks like your lower layers aren't as wavy.
It's primarily written for klipper, but I've been been getting pretty good results dialing in my was-an-ender with Ellis' tuning guide (all but eliminated my problems with elephants foot). It goes over exactly what a good first layer should look and feel like, plus extra related settings.