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I am trying to duplicate each side on an object. I have managed to mirror as per the image below, however I cannot work out how best to duplicate the other two sides where they're supposed to be (adjacent to the existing 2 sides)

The object itself is basically like a Greek pillar, where each side is the same. As I will be insetting each face, I want to duplicate each side so that the measurements are exactly the same

enter image description here

EDIT

Thanks for the response. However I've tried doing this but they aren't lining up properly? (see images below, also showing the settings applied)

enter image description here

enter image description here

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    $\begingroup$ The plane object is also at origin, otherwise you see the stepping effect shown above. Make one pillar at origin, then use group instances for pillars in model. $\endgroup$ – batFINGER Dec 30 '18 at 17:05
  • $\begingroup$ Shift+D, R, Z, 90, Ctrl+J, remove doubles will not do? Or even simpler: Alt + D, R, Z, 90. $\endgroup$ – Mechanic Dec 30 '18 at 17:24
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An array modifier.

enter image description here

Test image the plane created from front face of default cube. It still has the cube's origin. And is located at the origin. An empty is placed at origin and rotated 90 degrees in Z.

The empty is then used as the array modifiers object offset. There is no translation or non uniform scale to the empty. The only offset is the rotation in z,

The first copy will be rotated 1 x 90 degrees in Z, the second 2 x 90 and so on.

To add more pillars in the scene, make a group or in 2.80 a collection instance. Involves adding objects of pillar to a group (or collection) and adding a group instance from add object menu.

enter image description here Plane added to collection named "Pillar", A pillar can now be added at any time with shift A add collection instance, and choose Pillar. Every pillar in scene is made from one single 4 vertex plane mesh. Notice the option to offset an instance such that when placed its origin is at the base for example.

With Mirror Modifiers

enter image description here

Align the plane along the line x = y such that each end is (forgetting z) at (L, 0) and (0, L) in x and y. On a 45 degree angle from both x and y axis.

Mirroring in X creates a V, mirroring in Y a diamond.

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