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Brim setting is a thin additional layer printed at the base of the object to increase plate adhesion and limit object diplacement during printing. Raft setting allows for multiple objects to be connected with a "sheet" of interconnected plastic and keeps multiple parts from shifting when parts are printed simultaneously.
This setting determines the resulting density of the "core" of the object- A lower density setting results in a lighter object, less time to print, less plastic used, but lower strength and durability. A higher density setting results in a more solid core, more plastic used and more time to print and somewhat higher strength and durability characteristics. For most objects, a density setting of 30-50% is sufficient. 100% denisty = a solid object.
Select one only: Generating supports helps keep overhangs in your object from collapsing. The supports fill-in a pattern of plastic beneath the overhanging parts of your model and which are removed by you after the print job is completed. The choices are None (no support), Touching buildplate, and Everywhere. The choice "Everywhere" will create supports inside of some hollow objects, e.g., the setting everywhere would fill in the void space inside a whistle making it nonfunctional.