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Yes and no.
As a Mechanical Engineer who uses CAD all day with extensive experience in 3D printing (I owned my own printer at one point), I offer this: You could use it to test, but not as a permanent solution.
-It likely wouldn't handle the stresses.
-The ABS printing material also absorbs moisture, oil, gas, etc. which would seep out the underside of the manifold over time creating a mess in your engine bay.
-Many intake manifold have coolant flowing through them, at least briefly, which creates a whole new set of problems combined with the above
-Given the heat in the engine bay, the mounting surface/close to the head would be very likely to deform in certain conditions
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