Plastic profile extrusion system includes an extrusion die that pre-forms a hot, unfrozen plastic profile shape. Cooled calibration device receives the hot plastic in a longitudinal cavity through the calibration device to conductively cool the plastic as it holds the plastic profile to size and dimensions. For plastic parts with channels, inside corners, or other difficult to cool sections, the calibration device would require a metal ridge to hold the shape of that channel or corner as the heat is conducted from the hot plastic through the metal ridge into the body of the calibration device. This invention replaces metal ridges that hold the shape of the plastic profile during cooling in at least part of the calibration device with fluid cooling passages that communicates with the moving portion of the plastic profile and cooling medium to fill the flow passages to extract heat from the plastic material.