Raft is a very useful setting when you encounter 3D model warping problem. Today we are going to talk about the raft setting in the 3D slicing software.
Raft actually is the horizontal grid of filament that is located under the bottom of the 3D models as shown in the above pictures. The purpose of adding a raft is to ensure that the printed model can attach to the print bed more firmly to prevent the warping issues. Also, raft is useful if the bottom part of the 3D model is small because raft can increase the contact surface between the model and the print bed, which means can let the model stick on the print bed better.
If your 3D printer is a dual nozzle 3D printer, you can choose either left nozzle or right nozzle to print the raft in the Flashforge's 3D slicing software Flashprint as shown below: