Soluble Cores | Stratasys
Hollow, composite parts present a unique manufacturing challenge. Cores are used to create the hollow features in composite structures when smooth internal surface finish and seam-free construction are required. Some cores can be easily removed because of the part’s design geometry, but any configuration that traps a core or mandrel inside it requires special, often sacrificial tooling.
See more at: http://www.stratasys.com/solutions/additive-manufacturing/tooling/soluble-cores#sthash.Cv1TnLUp.dpuf
