What role does infill play in an FDM printed object?

Infill is a crucial element within Fused Deposition Modelling as it is responsible for providing internal structure and strength to the printed object. When a model is printed, the outer shell is created first, but the infill plays a vital role in ensuring that the object has the necessary structural integrity to withstand functional use. It is the interior material that fills the volume of the model, which can vary in density and pattern depending on the desired balance between weight, strength, and material usage.

For certain applications, having a solid infill contributes to the overall durability of the print. Different infill designs, such as honeycomb or grid patterns, enhance load distribution and can help resist deformation or breakage. This internal support system can also affect the thermal properties and weight of the final object, making it critical for balancing performance with material efficiency.

While infill can indirectly support overhangs and might influence external aesthetics through strength, its primary function remains to reinforce the internal framework, ensuring that the printed object meets its intended application requirements.