How to Cut an Object Using Knife Project in Blender 2.

Step-by-Step Guide

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   Step 1: Add a new cube by pressing ⇧ Shift+A » Mesh » Cube.

   You can do this by pressing the Numpad 5 key. ,, Then press S to scale the circle. , Hold down the ⇧ and right click on the circle first.
   
   Then right click on the cube. , In the Tool Shelf panel, select Tool » Knife Project.
   
   Press T to open the Tool Shelf panel if you don’t see it. , This will cut both two sides of the cube. ,, You will cut only one side of the cube – the front of the cube. ,
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   Step 2: Continue to add a new circle by pressing ⇧ Shift+A  » Mesh » Circle.

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   Step 3: Press the R key

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   Step 4: hit the X key and type 90 to rotate the circle 90 degrees around the x-axis.

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   Step 5: Switch from the Perspective View Mode (persp) to the Orthographic View Mode (ortho).

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   Step 6: Press the Numpad 1 key to view from the front of the cube.

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   Step 7: Press G to move the circle to the center of the cube.

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   Step 8: Press A to deselect all visible objects in scene.

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   Step 9: Switch from Object Mode to Edit Mode by pressing Tab ↹.

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    Step 10: Select the Cut through option in Knife Project.

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    Step 11: Press the Delete key » Faces to cut holes in the cube.

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    Step 12: Deselect the Cut through option.

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    Step 13: Press the Delete key » Faces to cut a hole in the front of the cube.

Detailed Guide

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