What post-processing step is critical for achieving maximum mechanical strength in SLA printed parts?

The post-processing step that is critical for achieving maximum mechanical strength in SLA (Stereolithography) printed parts is post-curing. Post-curing involves exposing the printed part to a specific wavelength of light (typically UV light) for a determined amount of time after it has been removed from the printer. This process further polymerizes the resin, strengthening the chemical bonds within the material and significantly increasing its hardness, tensile strength, and overall durability. During the SLA printing process, the resin is partially cured layer by layer. Post-curing completes this process, ensuring that the entire part achieves its maximum potential mechanical properties. Without proper post-curing, the part will remain relatively weak and brittle. The specific time and intensity of the UV light exposure depend on the type of resin used; resin manufacturers provide guidelines for optimal post-curing parameters. Therefore, even with optimal printing parameters, the full mechanical potential of an SLA part is unrealized without this final curing stage.