Abstract: Heat exchangers are manufactured by three-dimensional (3D) printers by printing subsequent layers of a material in a print direction. The heat exchangers include one or more tubes. The one or more tubes are configured to transport a fluid to be heated or cooled. Each of the one or more tubes defines a slope that is within a threshold angle of the print direction. The heat exchangers include a plurality of fins that are each configured to intersect with the one or more tubes while allowing fluid flow between the plurality of fins to heat or cool the fluid. Each fin of the plurality of fins defines a slope that is within a threshold angle of the print direction.

Abstract: A roller for a skating device comprising a first material having a minimum elastic modulus of 1 GPa, preferably at least 2 GPa, and more preferably at least 2.9 GPa and/or the maximum elastic modulus of the first material having 10 GPa, preferably at most 5 GPa, and more preferably at most 3.1 GPa.

Abstract: A kinetic section for a skating device comprising at least one ball and at least one roller, wherein the ball is adapted to be in contact with the roller at least at one point or contacting surface; and the ball is adapted to transfer an angular momentum to the roller; and a minimum coefficient of kinetic friction between the ball and a contacting surface of the roller is 0.16, preferably at least 0.20, more preferably at least 0.25, even more preferably at least 0.29 and/or the maximum coefficient of kinetic friction between the ball and the contacting surface of the roller is 0.50, preferably at most 0.40, preferably at most 0.45, more preferably at most 0.35, and even more preferably at most 0.31.

Abstract: A chassis for a skating device comprising at least one retention element comprising at least one of a sliding surface, a barrel-shaped roller, an hourglass shaped roller, a cylinder shaped roller, a bearing ball, at least one ball and at least one turning element.

Abstract: A ball comprising a first material having an elastic modulus of at least E=0.60 GPa, preferably at least E=0.70 GPa and more preferably at least E=0.73 GPa and/or a maximum elastic modulus of E=5 GPa, preferably at most E=3 GPa, more preferably at most E=1 GPa and even more preferably at most E=0.74 GPa, the first material defining at least an outermost section of the ball.

Abstract: Heat exchangers are manufactured by three-dimensional (3D) printers by printing subsequent layers of a material in a print direction. The heat exchangers include one or more tubes. The one or more tubes are configured to transport a fluid to be heated or cooled. Each of the one or more tubes defines a slope that is within a threshold angle of the print direction. The heat exchangers include a plurality of fins that are each configured to intersect with the one or more tubes while allowing fluid flow between the plurality of fins to heat or cool the fluid. Each fin of the plurality of fins defines a slope that is within a threshold angle of the print direction.