A method for forming a thermoplastic composite having one or more inner openings, comprising: heating the thermoplastic composite to a temperature above a melting temperature of the thermoplastic composite; arranging the heated thermoplastic composite comprising one or more inner openings and a surrounding region that surrounds the one or more inner openings in a mold that comprises one or more first mold parts for the one or more inner openings, respectively, and an oppositely arranged second mold part, wherein the surrounding region comprises one or more inner parts directly adjacent the one or more inner openings, respectively, and a common outer part, each inner part having an inner edge, and the common outer part having an outer edge; engaging the one or more inner parts using the one or more first mold parts and engaging the common outer part using the second mold part; mutually moving the one or more first and second mold parts thereby forming the one or more inner parts; wherein the mold further comprises a third mold part movably arranged around the one or more first mold parts, the method further comprising the step of clamping the common outer part in between the second and third mold parts during said mutually moving the one or more first and second mold parts while: allowing the one or more inner parts to move relative to the one or more first mold parts thereby increasing the one or more inner openings, respectively, and keeping the outer edge fixed in position relative to the second mold part and third mold part; wherein the one or more first and third mold parts are connected to a supporting frame, the mold further comprising one or more resilient elements, such as springs, arranged in between the supporting frame and the third mold part, and wherein said mutually moving the one or more first and second (110 mold parts comprises mutually moving the second mold part and the supporting frame while the third mold part is pushed towards the supporting frame by the second mold part thereby compressing the one or more resilient elements; wherein the one or more first, second, and third mold parts are heated to a temperature below the melting temperature of the thermoplastic composite. heating the thermoplastic composite to a temperature above a melting temperature of the thermoplastic composite; arranging the heated thermoplastic composite comprising one or more inner openings and a surrounding region that surrounds the one or more inner openings in a mold that comprises one or more first mold parts for the one or more inner openings, respectively, and an oppositely arranged second mold part, wherein the surrounding region comprises one or more inner parts directly adjacent the one or more inner openings, respectively, and a common outer part, each inner part having an inner edge, and the common outer part having an outer edge; engaging the one or more inner parts using the one or more first mold parts and engaging the common outer part using the second mold part; mutually moving the one or more first and second mold parts thereby forming the one or more inner parts; wherein the mold further comprises a third mold part movably arranged around the one or more first mold parts, the method further comprising the step of clamping the common outer part in between the second and third mold parts during said mutually moving the one or more first and second mold parts while: allowing the one or more inner parts to move relative to the one or more first mold parts thereby increasing the one or more inner openings, respectively, and keeping the outer edge fixed in position relative to the second mold part and third mold part; allowing the one or more inner parts to move relative to the one or more first mold parts thereby increasing the one or more inner openings, respectively, and keeping the outer edge fixed in position relative to the second mold part and third mold part; wherein the one or more first and third mold parts are connected to a supporting frame, the mold further comprising one or more resilient elements, such as springs, arranged in between the supporting frame and the third mold part, and wherein said mutually moving the one or more first and second (110 mold parts comprises mutually moving the second mold part and the supporting frame while the third mold part is pushed towards the supporting frame by the second mold part thereby compressing the one or more resilient elements; wherein the one or more first, second, and third mold parts are heated to a temperature below the melting temperature of the thermoplastic composite.