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Isolation Bearing floats to keep Z axis supported but does not translate vibrations to motion path.
You can watch and see the movement of the drive screw as the Z is travelled.
Bearings cost about $1.05 ea Traxxas 5118 8x16x5mm Replacement Precision Ball Bearings 688-2RS (10)
there is an area under the spiral that is "unsupported", The printing of it seems to work for me.