Support structures are temporary material added during 3D printing to hold overhangs, bridges, and other delicate features that would otherwise sag, warp, or detach while the part is being built. In resin printing, supports also help anchor the model to the build platform and reduce stress on thin sections during lifting and curing. After printing, they are removed and the surface is cleaned and finished.
They matter because support placement affects print success, surface quality, and material use. Too few supports can cause a failed print; too many can leave marks, increase cleanup, and waste resin. In practice, operators verify support generation in the slicer before starting a job, especially for complex or fragile models. In a security-minded workflow, a malicious or careless file can be used to create excessive supports or unstable geometry, wasting time and materials or causing repeated failures, so previewing the sliced output is an important defensive step.