Manufacturing rule: the design keeps the same cross-section all along a guide curve, like an extruded profile. Topology Optimization takes one per solve and not together with Symmetry. Leave its Boundary penalty at 0 for the cleanest result.
Curve the section is carried along (at least two points). Run it perpendicular to the design, from before its start to past its end.
Values the block gives besides its output. The editor lists them under Properties, and an input can read one by reference.
How far the Solid breaks the rule at each point, 0 where it is met; only there when a Solid is connected.
The steepest overhang allowed, measured against the build plate, in degrees.
The direction the part grows in, normal to the build plate.
The thinnest wall or smallest feature allowed.
The bound a Metric is held to (at most, at least, or equal).