Raft example

A Raft is a horizontal latticework of filament that is located underneath your part.  Rafts are primarily used with ABS to help with bed adhesion.  Rafts are also used to help stabilize models with small footprints, or to create a strong foundation on which to build the upper layers of your part. If your only concern is bed adhesion, you may want to skip to the brim section, as this can typically accomplish the same goal as a raft and is much faster to print.

fff settings raftIn this example, we will add a Raft to the popular “Dodecahedron” model. Here is your workflow:

  • Import the STL model file
  • Add a Process
  • Double-click on the Process to open the FFF Settings window (or click Edit Process Settings)
  • Click Show Advanced (if it is not already visible)
  • Click on the Additions tab
  • Place a check mark beside Include Raft


raft settingsThe 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.