Lattice Support structure
The Lattice Support 
tool creates a secondary type of additive support structure intended to be used with a Bar Support.
Lattice supports are bars that interconnect to create a scaffolding-like structure. The supports provide rigidity for parts with overhangs and undercuts, but can be difficult to remove.
Note: This feature is available only when you select a machine with additive MPBF or SLA/DLP capabilities.