Stator segment, for an electric machine, the stator segment comprising: a stack of at least three of a plurality of plates having main planar surfaces, the surfaces extending in a circumferential direction to a larger extent than in a radial direction, wherein the plurality of plates comprises at least a first plate having a first through opening (107, 109) of a first shape, and a second plate having a second through opening of a second shape different from the first shape, wherein the at least three plates are bounded at their main surfaces to form the stack such that a cooling conduit is formed inside the stack by at least partial overlap of the first through opening and the second through opening, wherein cooling fluid is guidable within the cooling conduit at least in the circumferential direction, wherein each plate comprises plural protrusions protruding radially for providing, when the stack is formed, plural teeth and slots alternating in the circumferential direction, wherein the first plate has the first through opening, provided to form an entry port for the cooling liquid, arranged at a first circumferential end of the first plate, wherein the first plate has another first through opening, provided to form an exit port for the cooling liquid, of the first shape arranged at another circumferential end of the first plate, wherein the second through opening extends (l) in the circumferential direction between 50 % and 99 % of a circumferential extent of the second plate, wherein the extend of the second through opening in the circumferential direction is a main portion of a circumferential extent of the second plate, wherein the second through opening comprises plural radially extending opening portions at respective plural circumferential positions corresponding to the plural protrusions, wherein an extent of the radially extending opening portions in the radial direction amounts to between 10 times and 100 times of an extent of the radially extending portions in the circumferential direction, wherein the plural radially extending opening portions may allow cooling of teeth of the stator segment, wherein the plurality of plates comprises a third plate having a plurality of third through openings of a third shape different from the second shape, the third through openings being arranged at plural circumferential positions, corresponding to the positions of the plural protrusions, the third through openings being in particular arranged at a same radial position, in particular corresponding to radial end portions of the plural protrusions. a stack of at least three of a plurality of plates having main planar surfaces, the surfaces extending in a circumferential direction to a larger extent than in a radial direction, wherein the plurality of plates comprises at least a first plate having a first through opening (107, 109) of a first shape, and a second plate having a second through opening of a second shape different from the first shape, wherein the at least three plates are bounded at their main surfaces to form the stack such that a cooling conduit is formed inside the stack by at least partial overlap of the first through opening and the second through opening, wherein cooling fluid is guidable within the cooling conduit at least in the circumferential direction, wherein each plate comprises plural protrusions protruding radially for providing, when the stack is formed, plural teeth and slots alternating in the circumferential direction, wherein the first plate has the first through opening, provided to form an entry port for the cooling liquid, arranged at a first circumferential end of the first plate, wherein the first plate has another first through opening, provided to form an exit port for the cooling liquid, of the first shape arranged at another circumferential end of the first plate, wherein the second through opening extends (l) in the circumferential direction between 50 % and 99 % of a circumferential extent of the second plate, wherein the extend of the second through opening in the circumferential direction is a main portion of a circumferential extent of the second plate, wherein the second through opening comprises plural radially extending opening portions at respective plural circumferential positions corresponding to the plural protrusions, wherein an extent of the radially extending opening portions in the radial direction amounts to between 10 times and 100 times of an extent of the radially extending portions in the circumferential direction, wherein the plural radially extending opening portions may allow cooling of teeth of the stator segment, wherein the plurality of plates comprises a third plate having a plurality of third through openings of a third shape different from the second shape, the third through openings being arranged at plural circumferential positions, corresponding to the positions of the plural protrusions, the third through openings being in particular arranged at a same radial position, in particular corresponding to radial end portions of the plural protrusions.