How can I mirror a cylinder using the Mirror Modifier in order to get two cylinders?
I want to edit one of the cylinders and get the same result on the mirrored one.
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You have to position your 3D Cursor away from the cylinder, then press Shift+Ctrl+Alt+C and choose the 3rd option- Origin to 3D Cursor. Next add a Mirror Modifier and choose the axis. Remember that the mirrored object appears on the same opposite distance from the origin, that's why you have to put your origin away from the Cylinder center, otherwise you will not be able to see any change, as your mirrored object will appear in the same position as your mesh.
Better than changing the objects Origin would be to use an apart from the origin located Empty as Mirror Object in the Modifier.