How would I go about scaling in one direction and on one side of an object?
I can’t manually select all vertices on one side as there’re just too many.
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You could use a different select mode, such as ring select.
Press “S” and then hit X, Y, or Z to make it scale to a specific direction.
For more info go here : Blender manual - Scale
Press tab to go into edit mode, then press 3 and click on a side, then move it by pressing g
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If it has a lot of faces, you can turn the camera to the side of the model, change the rendering mode to wireframe, and then select in one go all the faces on that one side of the object.