The raft layer is a type of support used to generate a supporting structure at the bottom of a model, lifting the entire model up. It is commonly used when printing filament that are prone to warping, such as ABS. Additionally, if the model has a small bottom surface area and is prone to edge warping, using a raft layer can provide extra adhesion area for the bottom surface, enhancing the adhesion between the bottom surface and the print platform, and preventing warping. The input value specifies the number of raft layers to be used.
The gap in the vertical direction between the top of the raft layer and the bottom surface of the model.
The smaller the raft layer Z distance, the tighter the bond between the raft layer and the model’s bottom surface, which improves the print quality of the bottom surface but makes it harder to remove. Conversely, a larger raft layer Z distance makes the raft layer easier to remove, but it reduces the print quality of the bottom surface because the model’s bottom surface will be a suspended surface and may collapse during printing. Generally, the default parameters are used, or it is set to be less than the layer height.