The Raft Settings dialog box provides four ways to modify the construction of your raft:
Raft Layers gives you control over the height of your raft. For this part, we used 3 layers.
Raft Offset determines how far the raft will extend beyond the part. Our 3.00mm setting means that the raft will be 3.00mm larger than the outline of the part.
Separation determines the distance between the raft and the part. The distance will impact the removal of your raft, and can be fine-tuned according to your model and your filament. Typical distances range from .14mm – .2mm.
Raft Infill controls the density of the interior of your raft. The infill percentage of a raft should be high enough to ensure that the first layer of your model is flat, but not so high that the raft becomes solid and bonds to your model. We used 80% infill for the test part.