I suppose that could be one approach, but i believe most people use sandpaper or a hobby knife (x-acto knife). Commonly followed by other post-processing (e.g. priming, painting)
It's mainly a visual thing on my pieces, one can hardly feel it when your run your finger over it. I would like to get it a bit smoother, but haven't been able to get it smoother with slicer settings yet.
Here is an image of my seam line:
And here shows a bit of stringing between the small layers:
Well, hello fellow X2 owner. I've had mine for almost 2 years. Still tweaking settings, but I just swapped it over to klipper about 3 months ago. Still not going too fast with outer perimeters running 40mm/s. Inner perimeters at 80-90mm/s. Travel at 200mm/s, supports at 150mm/s. Still have a slight stringing issue with pla with small detail layers. But I'll get you a picture later today of how my seams show up.
But yes, you can assign the position of your seams in most slicers. Basic settings are random, aligned, and back. (Most of the time these are in relation to print bed front/back, not object, so rotating the object can effectively 'move' the seam)
Also, most slicers have an option to paint on the seam.
Sounds to me like your issue is that the new nozzle now sits lower in relation to the old one. And so now your Z 0 puts the new nozzle tip below where your bed sits.
Since your not using a probe then all you'll need to do is move your end stop so it triggers at a higher position, and stops your nozzle from ramming the bed.
Move the endstop up higher and then let us know if that helps.
Hey man, your first layer isn't getting enough squish by the looks of it. It likes a decent amount of push into the bed compared to some other materials. PETG doesn't like as mush mash down as PLA. So if your printing PLA, try increasing your squish. You can do this via your z offset.
But do you really need your bed at 70? Mine runs and sticks just great at 60. 70 seems a bit warm for pla, as it keeps it just a bit too close to the glass transition temp for my liking. But if 70 has worked for you, then stay there.
But as another suggested, maybe raise your first layer temp by 5 or 10 and see if that helps. It might be that it needs a bit higher temp to flow better.