If you have a stereolithography (SLA) 3D printer, such as a Formlabs Form 3 or 3L, then you will need a way to post-cure parts with UV light.
Post-curing enables parts to reach the highest strength possible, so that they become stable. This is particularly important for parts that will be used in mechanical assemblies, or for functional parts. To give you an example of what post-curing with UV light does, with Formlabs Castable resin, it ensures a successful burnout. However, it is important to remember that different resins react in different ways to UV light.