A clamshell heat exchanger comprises upper and lower clamshell plates assembled together and sealed at the peripheral edges thereof, the assembled plates defining at least three internal passageways communicating in a serpentine configuration. The system includes an implicit geometry engine that is configured to receive three-dimensional colorized cloud point data regarding a 3D object of interest and to convert the cloud point data into implicit representations. The collapsible crowding tub includes a plurality of curved panels which are connected together in a substantially semi-circular pattern surrounding a fifth wheel hitch. The excavator thumb assembly also includes a thumb pivotally attached to the thumb attachment point along a thumb pivot axis, and operatively attached to the hydraulic cylinder shaft. The thermoplastic layer is laminated on top of the carrier; the polymer layer is laminated on top of the joined thermoplastic layer and carrier.