Smooth, evenly spaced stripes mean a smooth surface.

Display only — the export is the whole model.

How fine the exported mesh is. Smaller follows the shapes more closely and makes the export slower and larger; the view here is unaffected.

The largest part you can model, as a cube outlined on the bed.

Stitches the exact edge curve into the exported mesh.

On for parts that must measure true: a blend fills inside corners but never swells past the outer size. Off for flowing, organic surfaces, where the swell is the shape.