Mirroring object on Z axis not correct I am making a thor's hammer design following this tutorial:https://www.youtube.com/watch?v=6Yxrke72isQ .
at about 1:17:20, they mirror the rune like curves on the z axis. when i try this, it mirrors correctly on
X, but when i mirror it on Z, it is a little offset,and is not touching the hammer:

what am i doing wrong? this tutorial is pretty old so if there's something in lender please tell how to solve this.
The .Blend file:

EDIT
when i set the origin to geometry in the cube, this happens:
So what you're doing here is using your hammer object (called Cube) as Mirror Object. The problem is that the origin of Cube is not place at the center of its geometry, so the mirrored mesh will be a bit shifted. To fix that, in Edit mode select the top and bottom vertices of Cube and press ShiftS &gt; Cursor to Selected, then back into Object mode, right click &gt; Set Origin &gt; Origin to 3D Cursor. Now the ornment will stick to the surface.