Wavy lines, distorted wall surface finish , ripples  

RE: Wavy lines, distorted wall surface finish , ripples

So do I, but it's been really difficult to have good prints, and I'm also coming from an Ender 3.

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You can see from this picture that the walls are uneven, and have some sort of pattern like yours.

RE: Wavy lines, distorted wall surface finish , ripples

Hey guys, I realize this is a rather old thread, but I'm wondering if those posting resolved their problems, and how? I am here looking to resolve my own problem, which is more of a roughness in the shell while printing in 85A Flex. It was working well, with a lustrous shine, but recently it changed to a dull rough look. Soft Flex, of course, is it's own set of troubles, or perhaps you could say it amplifies existing issues that affect rigid filaments less. I did recently go around and tighten all the screws, assuming this was universally a good thing, trying to resolve a vibration noise issue. The noises are gone, but perhaps that correlates with my new roughness. I like the above checklist, I will definitely try that and the linearity link which is new to me. 

What I wanted to add here, which nobody brought up, are two other ideas. I've learned the hard way using Ninjaflex how troublesome poor filament diameter tolerances are (Ninjaflex is just terrible at this, it varies from 1.6mm to almost 1.8mm!). Perhaps something different in the Ender tolerates this better? Also, I know that I currently have an extruder temperature issue due to my last rebuild, I forgot to apply fresh thermal paste, and I can see that there is a wider temperature drift now because, I think, the firmware is tuned poorly for my differing thermal coefficient, and yes I did rerun that calibration routine (just haven't had time to rebuild it again). So, point being, temperature fluctuation could also be an issue. In Ninjaflex I've also found that the shell quality sometimes depends on flow variations, temperature variations, speed variations, and even fan speed variations--try viewing those options in the slicer to see if you see any correlated patterns.

RE: Wavy lines, distorted wall surface finish , ripples

It was working well, with a lustrous shine, but recently it changed to a dull rough look

One thing you didn't mention was drying the filament. TPU is notorious for sucking up humidity, which leads to wavy, coarse, dull surfaces. I dry TPU overnight at 65 Celsius for every print job and print straight from the dry box. 

RE: Wavy lines, distorted wall surface finish , ripples

Excellent point, I forgot to mention/suggest that. I learned that the hard way long ago, and have two of the little dryers just larger than a roll (e.g., Sunlu, etc.). On my Mini, I print straight out of that and basically always keep it running. On my MK3, presently for the down-feeding design I have nowhere to put the dryer, so I use it for a few days and then take the filament out to dry at least overnight. You do make a good point, I'm puzzling how the Mini is producing lustrous shine on the shell, while the MK3 next to it is dull and rough. And that's with the endless extrusion glitches due to not being direct drive! the Mini always looks great on the shell, but when extrusion trends low I get squishy (hollow) parts. The MK3 next to it, same part resliced for it, has rock solid extrusion consistency, but terrible shell.  Perhaps the moisture content is always higher, and variable between dry cycles. Thanks for the idea, I'll relocate things so I can feed the MK3 from the dryer!