What feature in 3D printing slicer programs helps a part stick to the build plate?

The raft is an additional layer or layers of material that are printed beneath the actual part being created. Its primary purpose is to provide a stable and adhesive foundation for the part, which aids significantly in adhering to the build plate. By enlarging the contact area between the print and the build plate, it helps mitigate issues such as warping and detachment that can occur during the printing process, particularly with materials that have a tendency to curl or lift at the edges.

In many cases, the raft consists of multiple thin layers that can be easily removed after the printing process is complete. This allows for the creation of parts with a better bottom surface finish and improved adhesion, ensuring that the model stays in place throughout the entire print cycle. Overall, the raft is especially useful for certain geometries or materials that may not have sufficient contact area or stability when printed directly on the build plate.