A method for injection molding plastic part(s) by means of an injection molding machine, wherein the method comprises the steps of (a) fitting the injection molding machine with an injection mold defining one or more molding cavities (8a,8b,8c,8d), the injection mold includes an injector mold plate and a reciprocating ejector mold plate, wherein both mold plates have front and back sides with the front side opposite the back side, and the backside of at least one of the mold plates (2,3) is traversed, respectively, by one or more open lengthwise channels (11,14) that are made by milling or cutting the backside of the respective mold plate (2,3) and that extend between an inlet and an outlet each through a free edge of the respective mold plate (2,3), with the one or more molding cavities provided in the front face and the free edge delimited between the front and back sides of the mold plate, wherein each channel has its own inlet and outlet, which one or more open lengthwise channels is first finally closed for circulation of a tempering medium once the mold plates (2,3) are in place in the injection molding machine, (b) providing a feed of plastic material having a first temperature within the processing window of the plastic material, (c) heating at least the one or more molding cavities (8a,8b,8c,8d) to a second temperature within the processing window of the plastic material and maintaining the injection mold in closed condition at said second temperature by circulating through the one or more channels (11,14) a first tempering medium having a third temperature, (d) injecting plastic material having the first temperature into the closed heated mold at an injection pressure less than 100 kg/cm 2 to fill the one or more molding cavities (8a,8b,8c,8d), (e) cooling at least the one or more molding cavities (8a,8b,8c,8d) of the filled closed injection mold to a fourth temperature below the first temperature until at least partly solidification of the molded plastic part(s) inside the injection mold by circulating through the one or more channels (8a,8b,8c,8d) a second tempering medium having a fifth temperature, (f) opening the injection mold by parting the injector plate from the ejector plate, (g) ejecting the at least partly solidified molded plastic part(s) by actuation of ejector pins of the ejector plate, and (h) repeating the cycle of steps (c) - (g) until the desired number of plastic parts are produced. (a) fitting the injection molding machine with an injection mold defining one or more molding cavities (8a,8b,8c,8d), the injection mold includes an injector mold plate and a reciprocating ejector mold plate, wherein both mold plates have front and back sides with the front side opposite the back side, and the backside of at least one of the mold plates (2,3) is traversed, respectively, by one or more open lengthwise channels (11,14) that are made by milling or cutting the backside of the respective mold plate (2,3) and that extend between an inlet and an outlet each through a free edge of the respective mold plate (2,3), with the one or more molding cavities provided in the front face and the free edge delimited between the front and back sides of the mold plate, wherein each channel has its own inlet and outlet, which one or more open lengthwise channels is first finally closed for circulation of a tempering medium once the mold plates (2,3) are in place in the injection molding machine, (b) providing a feed of plastic material having a first temperature within the processing window of the plastic material, (c) heating at least the one or more molding cavities (8a,8b,8c,8d) to a second temperature within the processing window of the plastic material and maintaining the injection mold in closed condition at said second temperature by circulating through the one or more channels (11,14) a first tempering medium having a third temperature, (d) injecting plastic material having the first temperature into the closed heated mold at an injection pressure less than 100 kg/cm 2 to fill the one or more molding cavities (8a,8b,8c,8d), (e) cooling at least the one or more molding cavities (8a,8b,8c,8d) of the filled closed injection mold to a fourth temperature below the first temperature until at least partly solidification of the molded plastic part(s) inside the injection mold by circulating through the one or more channels (8a,8b,8c,8d) a second tempering medium having a fifth temperature, (f) opening the injection mold by parting the injector plate from the ejector plate, (g) ejecting the at least partly solidified molded plastic part(s) by actuation of ejector pins of the ejector plate, and (h) repeating the cycle of steps (c) - (g) until the desired number of plastic parts are produced.