Call .scale.set(x, y, z) in the grid (see this ticket ).
Initially, the scale has the value (1, 1, 1) (see the constructor of Object3D , the parent class of the Mesh ), you will want to increase these values ββby the required percentage scale in the required sizes.
In this fiddle I enlarge the cube in all directions by 50% using .scale.set(1.5, 1.5, 1.5) .
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