This is a high gripping force clamp configuration (relative to other FDM versions) that was re-engineered to included the following features
Triangular Cross-Section Threaded Drive Rod. This insures the drive rod is always centered in the treaded fitting while allowing a large contact area with the print bed. This design increases strength and lower material use and build time compared to vertically build threaded rods.
Capture mechanism designed into the reaction bucket so the jaws open and close automatically with the drive rod rotation. The original design required the lower jaw be manually opened.
Reduced number of external retention parts by 60% via incorporating internal capture features in the jaws. The design only requires two external pegs to secure the threaded fitting into the upper jaw.
Reduced material use and build time by re-designing the jaws to use stiffeners where loads were applied or re-directed.
Hank
