Raft Base Extruder
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This setting selects the extruder to use for the base layer of the raft.

![Where the base layer is located in the raft](../images/raft_dimensions_simplified.svg)

The base layer is the one that rests on top of the build plate. It must provide ample adhesion to the build plate, so it is good to choose a material for this that sticks well to the build plate and doesn't shrink.