Replicator 2 & 2X, Z axis Ballast (FIX)

The replicator 2 and 2X have issues with its Z axis having play, movement and stickiness which causes uneven print layers. You will notice this by jogging the Z axis up about 3/4 of the way. If you push up on the build plate from the bottom and pull down on it you will notice the play. Although that play is very minimal, it dramatically effects your print layers. The stickiness in the Z axis occurs because of the bushings.If the Z axis used linear bearings instead of bushings this would not occu