What would cause the outer walls to look like this? I’ve tried different files, reoriented the print on the bed, tightened the belts, lubed the carbon rods, slowed down to silent mode. I’m out of ideas. Had the printer for over a year and it has always had the “resonance frequency of the X axis is low” warning, but tightening the belts has never made the warning go away. Not sure if they could be related, but tightening the belts did nothing anyway. Printed with Overture PLA Pro.
Hi Welcome to the forum.
I think you need to read this wiki.
It has a lot of very important info about cleaning carbon rods and not putting a lubricant on them. Also the proper way of tightening the belts. Such as loosening the eight screws and moving the x carriage around a few times before snugging the screws up.
Then a full calibration after all of this cleanup.
Hope this helps with your printer.
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I feel like such an idiot. Pretty sure I found the problem while cleaning the extruder. Went to put the nozzle back on and noticed it said 0.8mm. Totally forgot I put that on there. Been slicing everything for 0.4mm nozzle! 
Running a test print now, but pretty sure I’ve solved my problem. If nothing else, my printer has gone through a full tune-up, which it was well overdue for.
We all make minor mistakes on our printers.
Like start printing without the build plate replaced on the heatbed. . 
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So, I’m running into this same printing result on my P1S, buuuut it’s a little bit different situation. My prints look like that, but I’m using a P1S and Giantarm Silk PLA. I was trying to do an Iron Man faceplate, which I was hoping would end up smooth, and 90% of it was, except the curved inside of the “cheek” facing the chamber cooling fan (the big one on the left side of the bed). I have a suspicion it is something to do with cooling, but haven’t figured out a way to calibrate for that quite yet. I’m just going to continue with the project for now and turn the parts so the backs are facing the cooling fan to see if that helps any.