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ah yes thank you for pointing that out also 1 blender unit is you know that grid when your in top front or side view well 1 box is 1 blender unit so putting extrude along the X axis then put 1 it will extrude it along the x axis 1 blender unit you can go into real detail and extrude objects to like 1.3521 along the x axis for precise detailed models also ive heared somehwere that 1 blender unit is 512px x 512px
hope we could help
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