Which aspect does good cooling enhance in FDM printing?

In Fused Deposition Modeling (FDM) printing, good cooling primarily enhances dimensional accuracy. When the extruded thermoplastic material is rapidly cooled, it solidifies more quickly, reducing the potential for warping or deformation as the layers are laid down. This cooling effect helps to maintain the intended dimensions of the printed part, as the material shrinks uniformly and adheres better to the layers beneath it.

Maintaining proper cooling not only ensures the fidelity of the model's geometry but also contributes to achieving tighter tolerances, which is especially important in applications requiring precise fit and function. The cooling process helps prevent issues like stringing and oozing that can arise from overheating, which would likely lead to dimensional inaccuracies.