Build plate adhesion settings

Enable prime blob

This setting is for dual extrusion machines only. The printer normally starts with a blob of material, to prime the nozzle. Disable this setting to use the skirt or brim to prime the nozzle instead.

Build plate adhesion extruder

This setting determines which extruder prints the selected build plate adhesion method. This setting is only available in dual extrusion machines.

Build plate adhesion type

There are three types of build plate adhesion: skirt, brim and raft. You can also easily disable the adhesion types by setting it to None.

BuildPlateAdhesionType.pngThis model has the build plate adhesion types from left to right: skirt, brim and raft


Brim adds a single layer flat area around the base of the model to prevent warping. The brim is connected to the model and makes the bottom surface area bigger. This increases the adhesion to the build plate and, in case of warping, the corners of the model are less likely to curl up because of the brim attached to it.

Materials that have a high potential for shrinkage (e.g. ABS) can benefit from using a brim. Models that have a very big base or very thin parts at the bottom will also stick better to the build plate with a brim.

There are multiple options available for the brim setting:

  • Brim minimum length: The length in millimeters here is the amount of filament that is extruded, regardless of the other brim settings
  • Brim width: This setting adjusts the width of the brim in millimeters
  • Brim line count: This setting overrides the brim width, setting the width by the number of printed lines
  • Brim only on outside: This setting ensure that models with holes on the initial layer, like a donut shape, only have brim on the outside of the model


A raft adds a thick grid with a roof between the model and the build plate. This can be useful when the bottom surface of a model is not completely flat or has little adhesion to the build plate. A raft ensures that the model will stick better to the build plate.

The raft options in Ultimaker Cura are extensive. The raft is divided into three parts: top layers, middle layers and base layers. The image below explains the raft settings that are available. It is important to know:

  • Initial Z overlap: This setting lowers all layers of the model, except the initial layer, to compress the initial layer against the raft.
  • Raft base layer: This layer needs to be pressed right up against the build plate and therefore looks oversized.

raft-airgap.pngA visualization of the raft settings in Ultimaker Cura

The final result when printing with the raft as visualized above will end up like in the image below.

raft-printed.pngThe result of the printed raft


A skirt is a line printed around the object on the first layer, but not connected to the object. This helps prime the extrusion nozzle and can be an additional check for bed leveling before the print begins.

If you select a skirt, you can adjust the following parameters:

  • Skirt line count: The number of skirt lines printed around the model
  • Skirt distance: The distance between the model and the skirt
  • Skirt minimum length: The total length of the skirt. This will override the skirt line count when the minimum length is not reached yet

Continue reading about Dual Extrusion settings.

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