Supports or rafts: This part does not need supports or rafts. The last layers of the object have been designed as a bridge and not as a dome. Also, the bridge is inside and therefore there is no point to waste material.
Perimeters: Three lines perimeter.
Layer Height:Low layer height, i.e. 0.1 mm. It affects mostly the last layers, which is the bottom of the model. A higher layer can be used, but it will not make a nice bottom surface (or top during 3D printing). However, because the object is placed upside down, you will not be able to notice this detail. Otherwise, use a high layer for the most of the part and at the end of the object use 0.1 mm.
Printing speed: High printing speed, with low to medium gap speed. However, the high speed can ruin the object's surface due to the vibrations.
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