I spent a year trying to get my Prusa factory assembled mk4s to print properly. Prusa support even eventually sent me a full replacement printer that had the EXACT same problem out of the box.

I returned it, bought an LDO Voron kit for a 2.4 350mm and haven’t looked back.

The kit had pre made harnesses, which was 100% the right move for me.

(Incidentally, the drawers for my desk I was trying to print on the Prusa originally are now printed and finished on the Voron, and working great…)