Various dimension types are available in 3D sketches: absolute, along X, along Y, and along Z.
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Absolute
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Measures the absolute distance between two points. If you press Tab to dimension along an axis, keep pressing Tab until the pointer changes back to  to get an absolute measurement.
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Along X
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Measures the distance between two points along the X axis. Press Tab once to measure along the X axis.
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Along Y
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Measures the distance between two points along the Y axis. Press Tab twice to measure along the Y axis.
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Along Z
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Measures the distance between two points along the Z axis. Press Tab three times to measure along the Z axis.
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