Flip a geometry along a defined axis.
Select a geometry you want to mirror
Click More Tools → Move → Mirror, or Use hotkey shift + M, or tap spacebar and select Mirror
Define the axis you want to mirror along:
Click to start. Click to end
Use S to snap to edges or corners to define the axis
Click the geometry.
Click and drag the center of a selection box edge.
While clicking, type -1 and tap enter.
The geometry will mirror.
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