The Boundary Strut Diameter feature allows you to set the diameter for all struts on the surface, regardless of the parameters applied throughout the rest of the lattice. This can be useful with multi-zone lattices to provide a consistent surface appearance.

The example below has two different strut diameters:

The boundary strut diameter has been set to match the larger 1.0 mm diameter. Note in the perimeter zone that the surface struts change while the interior struts remain unchanged at the smaller 0.5 mm diameter.