What effect does increasing shell thickness have on an FDM print?

Increasing shell thickness in an Fused Deposition Modeling (FDM) print has a significant impact on the print's overall strength and printing time. When shell thickness is increased, it results in more material being used on the outer walls of the print, which enhances the structural integrity. A thicker shell provides greater resistance to external forces and improves the overall durability of the final product, making it less prone to cracking or breaking under stress.

Additionally, a thicker shell also leads to longer printing times since more layers of material have to be extruded to build up the walls of the object. This increase in time is a direct consequence of the additional material laid down during the printing process, which can affect production speed and efficiency.

In contrast, making the print lighter, improving aesthetic appeal only, or not affecting the print are not accurate consequences of increasing the shell thickness. While aesthetics may be influenced by a thicker shell, this is not its primary intent or benefit. Additionally, increasing shell thickness does not promote a lighter print; rather, it adds weight due to more material being used. Therefore, the choice highlighting the increase in print strength and time aligns with the essential characteristics of FDM printing and the direct outcomes of modifying shell parameters.