A method for moulding of a thermoplastic article comprising the steps of: - Injection moulding at a first moulding station, in which is mounted a first moulding tool assembly comprising at least its shape defining elements comprising a first core and a first cavity , which define two opposing surfaces of a first part to be moulded and when fully closed define at a parting surface a first chamber enclosing a fixed first volume separable, said first moulding tool assembly having internal means of heat removal and further comprise a first runner flowably communicating between the chamber and injection moulding machine melt passage , - Closing the first core , the first cavity , the first runner and means of blocking making up a first set and for the process of moulding wherein after closing the first core and the first cavity the first part is moulded by injecting pliable polymer first resin via the first runner in the first chamber till it is completely filled as per predetermined first process parameters, - Cooling by a first cooling step by passage of cooling medium through the internal means of heat removal , - Introduction of additional material into the first chamber flowing via the first runner under second process parameters, differing form the first process parameters, - Blocking the first runner after introducing the additional material, - Subsequent to blocking of the first runner further cooling by a second cooling to solidification by combining cooling with application of external force in a cooling station , wherein application of the external force deforms adaptively at least one surface of the first part and wherein the process of second cooling is carried out distal from the moulding station. - Injection moulding at a first moulding station, in which is mounted a first moulding tool assembly comprising at least its shape defining elements comprising a first core and a first cavity , which define two opposing surfaces of a first part to be moulded and when fully closed define at a parting surface a first chamber enclosing a fixed first volume separable, said first moulding tool assembly having internal means of heat removal and further comprise a first runner flowably communicating between the chamber and injection moulding machine melt passage , - Closing the first core , the first cavity , the first runner and means of blocking making up a first set and for the process of moulding wherein after closing the first core and the first cavity the first part is moulded by injecting pliable polymer first resin via the first runner in the first chamber till it is completely filled as per predetermined first process parameters, - Cooling by a first cooling step by passage of cooling medium through the internal means of heat removal , - Introduction of additional material into the first chamber flowing via the first runner under second process parameters, differing form the first process parameters, - Blocking the first runner after introducing the additional material, - Subsequent to blocking of the first runner further cooling by a second cooling to solidification by combining cooling with application of external force in a cooling station , wherein application of the external force deforms adaptively at least one surface of the first part and wherein the process of second cooling is carried out distal from the moulding station. <EOS>