If you have extruder issues with jamming, try calibrating the filament thickness and steps per E very carefully: too much extruded material will cause a pressure buildup in the bowden tube and the extruder will slip and strip the filament, causing a jam.
Slower printing allows for a bit of extra plastic to push through during infills, and an alternative is to get a new feeder. I got the one by Ghagen which grips the filament so well that the motor skips steps without skipping; this lowers the pressure in the bowden tube and does not jam.
The wobbling can be caused by slack belts (backlash) or dynamics problems where you make steps so fast that you get overshoots (and corrections). Printing slower always works.
The promo pictures look so good because they print at 25mm/s, 0.05mm per layer, and around 200-220C. Also using belt tensioners will help too
Dont expect to get a good print in the first run, I usually mess up 2-3 prints before I got a good one. Its all in the first layer...
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