Tightening the left eccentric nuts near the leadscrew leads to this rubbing. Making it any looser will leave 2/3 wheels in a free spin.
I'm starting to think that it would be cheaper to get a P1P...
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Yea I was considering writing a paragraph about how double lead screws also needed some careful adjustments, and wouldn't eliminate problem automatically, but it felt like the comment was starting to get too long anyway.
Linear rails also needs some work though. If you have two on the Z axis you have to make sure they're perfectly parallel, and most likely they'll only have a thin protective oil from factory so you'll have to clean them and apply a lubricant. Nothing super complicated, but a few steps that are possible to screw up for a beginner :) And when people buy linear rails, many go for the cheapest they find on amazon/aliexpress/wish and those can have manufacturing or quality control issues. If it's possible to properly align your v-slot rollers, those might actually be better than cheap linear rails. If you pay for quality linear rails that ought to be the best solution. IIRC "good enough" linear rails cost about €25 each, no need to get genuine Mizumi or Hiwin on a cheap bedslinger printer IMO