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First, most 3D printers won't be able to print something as large as an OTA. Second, carbon charged plastic will be nowhere near as stiff/strong as proper skinned tube. Carbon fibers in a cloth (that is used for lamination) are contiguous and very long; it's their extraordinary resistance to stretching that gives stiffness and thermal stability. Carbon in 3D printed items is a mass of very short and small fibers that are not connected in any way. Better than ordinary PLA or ABS, sure, but you will never see any bows, arrows, fishing rods, skis, surfboards or telescope OTAs (anything that requires stiffness or thermal stability) 3D printed.
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