For that one Z rod that has the wobble in it. If all your other Z rods are straight, install this floating bracket and keep the one wobbly rod from zigzaggling all your prints. Thanks to twotimes for the bracket design; I thickened the outer portion, widened the screw holes, and reduced the vertex count to keep the hole printing ruly.

Print the wobble bracket, then remove the "zg" wooden piece from the Z stage on the rod that's wobbly. Install the wobble bracket under the Z stage. For extra wobble resistance, leave out two of the screws. Then level out your Z stage platform again and you're done!