How does infill density affect the print's weight and strength?

Infill density is a critical parameter in 3D printing that directly influences both the weight and strength of a printed object. When the infill density is increased, the internal structure of the print becomes more solid, leading to greater material usage. This increase in the amount of material directly adds to the overall weight of the finished product.

Moreover, a higher infill density contributes to enhanced strength. When the interior is filled with more material, the object can better withstand external forces and stresses, thereby increasing its structural integrity and durability. This makes the printed item stronger, which is crucial for applications where mechanical properties are important.

Additionally, using a higher infill density will typically lead to longer print times. More material means that the printer has to take more time to lay down the additional filament, which can extend the total time needed to complete the print.

In contrast, lower infill densities would lead to lighter prints but at the cost of strength, making them more prone to deformation or breakage under load. Hence, option C accurately captures the relationship between infill density, print weight, strength, and print time.