This helps to properly purge the hotend and can be an additional check in case the printing surface needs to be leveled before printing.
When selecting brim, a flat area is added to the first layer of the model around its base, which increases the contact area and improves adhesion.
With the use of the raft, a thick grid is added between the model and the printing surface. This can be useful when the bottom surface of the model is not completely flat or has poor adhesion.
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It's important to keep your printer in good shape to make the most out of it. In this chart, you can find a list of the extruder maintenance procedures and how frequently these should be done.
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