The Z is backwards on the left cube... no amount or rotating it will fix this.
Mirrored printing on a delta normally means you have assigned the XYZ towers incorrectly. Convention is that the X tower is front left, the Y tower is front right, and the Z tower is back center.
Swap the stepper motors and endstop plugs on the controller to match this configuration.
Edited 1 time(s). Last edit at 11/13/2019 10:10PM by Dust.