positioned in the fillet area over the uncured details the assembly is then either locally bagged or completely bagged and autoclave cured under pressure under pressure the mandrel 230 intensifies the pressure in the uncured fillet area and enables a stronger bond between the bonding structures 205 210 following curing of the preform the ratio of radii 232 and 234 in the mandrel 230 can be selected to improve the part definitions in the fillet area preferably the mandrel 230 is designed with a specific ratio of radii as to design a large outside radius 232 to act as a pressure multiplier ratio of areas to the smaller radius 234 and therefore consolidate the composite preform well an exemplary ratio of radii 232 and 234 is r0 75 and r 0 03 respectively rubber type parts can be fabricated by pouring or injecting rubber as a fluid into a metal or wood tool for example which is configured to simulated a rib and a skin for example intersecting at an arbitrary angle the tool works essentially as a mold allowing the rubber to cure into such a configuration however metal or wood molds typically require a machining processes to define the required shape conventional machine tool subtractive methods typically involve a large initial expense for engineering drawing and setting up the proper machining protocol and tools as such the set up time is not only expensive but relies a great deal on human judgment and expertise another difficulty.