The Mirror tool in uMake is very useful if you want to reflect objects over a chosen axis to create a symmetrical design. In design, it is often easier to work on just one side of a design, and then reflect that side over an axis to create a symmetrical design. You can use the Mirror tool to do this. Simply select curves, surfaces or groups of objects, and then tap mirror. This will give you the choose to reflect the selected objects over the X, Y, or Z axis. Tap on one of the Axes and uMake will create a mirrored copy of the selection on the other side of the axis.
BONUS: If you use Mirror with symmetry on, then any object reflected over an axis will update if you need to modify that object in the future and symmetry is still on.