Simplify3D

Simplify3D occupies a unique position in the 3D printing ecosystem as the premier *paid* slicing software in a market largely dominated by highly capable free, open-source alternatives. For many years, it was considered the absolute gold standard for professional desktop 3D printing, prized for its incredibly fast slicing engine, unparalleled print quality, and a level of granular control that free software simply could not match at the time. It is highly favored by commercial 3D printing services, professional engineering firms, and serious enthusiasts who require absolute reliability across massive "fleets" of diverse 3D printers. The software's most famous and historically defining feature is its deeply customizable support structure generation. Long before free slicers adopted the feature, Simplify3D allowed users to manually place, move, and delete individual support pillars. Furthermore, the way Simplify3D calculates the interface layer—the tiny gap between the temporary support structure and the actual model—results in supports that "snap" off with incredible ease, leaving behind a virtually flawless surface finish. This is critical for engineers printing complex mechanical parts where post-processing sanding is not an option. Simplify3D also excels in its handling of multi-part printing. In a professional setting, a user might need to print 10 different, distinct models on a single build plate simultaneously. Simplify3D allows the user to assign completely different slicing profiles to each individual model on the plate. For example, one part can be printed with 10% infill for speed, while a structural bracket right next to it is printed with 100% solid infill for strength. Additionally, its incredibly fast slicing engine and highly accurate G-code preview (allowing users to watch a virtual simulation of the print line-by-line) help professionals identify and correct potential failures before wasting hours of printing time.