A component carrier, comprising: a layer stack formed of an electrically insulating structure and an electrically conductive structure; a bore extending into the layer stack and having a first bore section with a first diameter and a connected second bore section with a second diameter differing from the first diameter; and a thermally conductive material filling substantially the entire bore, wherein in a cross-sectional view of the bore, the walls forming the first bore section have a curved shape, wherein the layer stack comprises a first surface and a second surface opposing the first surface, wherein the bore extends between the first surface and the second surface, and the first diameter corresponds to the opening diameter of the first bore section at the first surface and the second diameter corresponds to the opening diameter of the second bore section at the second surface, wherein the first bore section extends from the first surface into the layer stack and the second bore section extends from the second surface into the layer stack, wherein the first diameter of the first bore section is larger than the second diameter of the second bore section, wherein between the first bore section and the second bore section a transition section is formed, wherein in a cross-sectional view of the bore, the transition section forms an S-shape run, wherein the first bore section comprises a first aspect ratio which is the ratio between a first length of the first bore section and the opening diameter of the first bore section at the first surface, wherein the second bore section comprises a second aspect ratio which is the ratio between a second length of the second bore section and the opening diameter of the second bore section at the second surface, said first aspect ratio and second aspect ratio being each smaller than 1 and wherein the first aspect ratio is smaller than the second aspect ratio, and the first length of the first bore section is larger than the second length of the second bore section, wherein the first bore section and the second bore section have each a conical shape so that the first diameter of the first bore section at the first surface reduces from the opening section of the first bore section at the first surface along the direction of the transition section, whereas the second diameter of the second bore section reduces from the transition section along the direction to the second opening section of the second bore at the second surface. a layer stack formed of an electrically insulating structure and an electrically conductive structure; a bore extending into the layer stack and having a first bore section with a first diameter and a connected second bore section with a second diameter differing from the first diameter; and a thermally conductive material filling substantially the entire bore, wherein in a cross-sectional view of the bore, the walls forming the first bore section have a curved shape, wherein the layer stack comprises a first surface and a second surface opposing the first surface, wherein the bore extends between the first surface and the second surface, and the first diameter corresponds to the opening diameter of the first bore section at the first surface and the second diameter corresponds to the opening diameter of the second bore section at the second surface, wherein the first bore section extends from the first surface into the layer stack and the second bore section extends from the second surface into the layer stack, wherein the first diameter of the first bore section is larger than the second diameter of the second bore section, wherein between the first bore section and the second bore section a transition section is formed, wherein in a cross-sectional view of the bore, the transition section forms an S-shape run, wherein the first bore section comprises a first aspect ratio which is the ratio between a first length of the first bore section and the opening diameter of the first bore section at the first surface, wherein the second bore section comprises a second aspect ratio which is the ratio between a second length of the second bore section and the opening diameter of the second bore section at the second surface, said first aspect ratio and second aspect ratio being each smaller than 1 and wherein the first aspect ratio is smaller than the second aspect ratio, and the first length of the first bore section is larger than the second length of the second bore section, wherein the first bore section and the second bore section have each a conical shape so that the first diameter of the first bore section at the first surface reduces from the opening section of the first bore section at the first surface along the direction of the transition section, whereas the second diameter of the second bore section reduces from the transition section along the direction to the second opening section of the second bore at the second surface.