Abstract: Printhead for a 3D manufacturing system that uses metal electrodeposition to construct parts; embodiments utilize a grid of anodes to achieve high quality parts with features that may be small and detailed. To support grids with thousands or millions of anodes, the printhead may use matrix control with row and column drivers similar to display backplanes. Unlike display backplanes where the design goal is to display images using minimal current, the printhead may be optimized for high current density for fast electrodeposition, and for anode longevity. Current density may exceed 1000 mA per cm-squared, at least an order of magnitude greater than that of display backplanes. Anode longevity may be enhanced by using relatively large anodes compared to the grid pitch of the printhead, by lengthening the conductive paths through anodes, or both. Embodiments may be constructed by adding anode and insulation layers on top of matrix-controlled switching circuits.

Abstract: A ski may define a body that defines a tip, a tail opposite the tip, a top sheet, a base extending from the tip to the tail and opposite the top sheet, a core layer positioned between the base and the top sheet, and a reinforcement layer positioned between the top sheet and the base. The reinforcement layer defines an aperture extending through the reinforcement layer and positioned within a first third of a length of the ski, the length defined from the tip to the tail.

Abstract: A ski may define a body that defines a tip, a tail opposite the tip, a top sheet, a base extending from the tip to the tail and opposite the top sheet, a core layer positioned between the base and the top sheet, and a reinforcement layer positioned between the top sheet and the base. The reinforcement layer defines an aperture extending through the reinforcement layer and positioned within a first third of a length of the ski, the length defined from the tip to the tail.

Abstract: A ski may define a body that defines a tip, a tail opposite the tip, a top sheet, a base extending from the tip to the tail and opposite the top sheet, a core layer positioned between the base and the top sheet, and a reinforcement layer positioned between the top sheet and the base. The reinforcement layer defines an aperture extending through the reinforcement layer and positioned within a first third of a length of the ski, the length defined from the tip to the tail.

Abstract: A method for comparing a first drawing and a second drawing generated by a shape-based computer system includes: (a) In no particular order: (1) identifying shapes present in the first drawing; and (2) identifying shapes present in the second drawing. (b) In no particular order: (1) identifying deleted shapes; the deleted shapes being present in the first drawing and not present in the second drawing; and (2) identifying new shapes; the new shapes being present in the second drawing and not present in the first drawing. (c) In no particular order: (1) indicating the deleted shapes in the first drawing; and (2) indicating the new shapes in the second drawing.

Abstract: A method for comparing a first drawing and a second drawing generated by a shape-based computer system includes: (a) In no particular order: (1) identifying shapes present in the first drawing; and (2) identifying shapes present in the second drawing. (b) In no particular order: (1) identifying deleted shapes; the deleted shapes being present in the first drawing and not present in the second drawing; and (2) identifying new shapes; the new shapes being present in the second drawing and not present in the first drawing. (c) In no particular order: (1) indicating the deleted shapes in the first drawing; and (2) indicating the new shapes in the second drawing.