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In these designs, when the rod is only constrained at one end,
if the rod is not perfectly straight (which none are), the free
end will move in small circles ..., but the Z axis will not be affected because the
smooth rods constrain it to a linear path, and the shaft
couplers allow a bit of flex when the Z nuts push the rod in
one direction or another. Some less experienced users were
confused or concerned by the wobble exhibited by the free ends
of these rods and decided to put bearings on them to prevent
this wobble. ... With both ends of the threaded rod now
constrained ..., the curvature of the rod again started pushing
the Z platform in small circles around it. The smooth rods
resisted this force, and tried to bend the threaded rods
straight to counteract it, but the threaded rods were just as
thick, so the result was that both rods deflected a bit, and Z
wobble was allowed to occur.

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esus christ, why are people _STILL_ doing this crap? DO NOT DO THIS. Nophead and others have told you it's a stupid idea, why do you continue to insist it's a good one? :/

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Letztlich habe ich mich für einen vollständigen Bausatz eines Entwicklers aus Manchester entschieden.