How Does Print Orientation Affect Part Strength?

FDM parts are not isotropic: they are strong along the layer plane and weak in the interlayer direction. The strength of the same part can vary by a factor of 2–3 depending on the print orientation — this is the most critical piece of knowledge in functional part design.

The rule: the primary tensile/bending force acting on the part must be parallel to the layer plane. For example, printing a hook horizontally (with layers running in the load direction) produces a result many times stronger than printing it vertically; a vertically printed hook will fail at the layer interface.

Orientation also affects surface quality (top surfaces are smooth, supported surfaces show marks), support requirements, and print time. When placing a functional order, indicate in the form where the part will receive its load — our production team will handle the optimal orientation.