If you have one or more carriages wobbling, the most probable cause is that you do not have your eccentric nuts adjusted.
You will find two eccentric nuts for the bed carriage, two for the X carriage and 4 for the Z carriages.
Using a wrench, turn the eccentric nuts until you get a good grip from the wheels.
Adjust all the eccentric nuts.
Move the axis manually and make sure they are not too tight or loose.