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Why introduce needless complexity? The bed gets out of level over time (or the surface treatment does or whatever). Changing the lead screws minutely means having to turn the bot upside down, loosen the pulleys on each one, then turn it back over, tram the build surface to the extruder, then not disturb any of that, turn the bot back over, then tighten down all the pulleys without disturbing the lead screws. Pretty complicated and not likely to work the first couple of times -- you're likely to discover that
something moved a tad and now isn't trammed.

You have to loosen the pulleys since otherwise, turning one leadscrew any amount turns all the others. And you have to keep all the pulley's sync'd with the belt.