The bronze doors on the Passion façade made by Subirachs, the ones most recently placed on the Nativity façade made by Etsuro Sotoo (who manages the Temple’s team of sculptors) or the bronze crown that was placed on the highest point of the dome of the western sacristy in March 2016, are good examples of the application of the lost-wax casting technique.
You can see the lost-wax casting technique that was followed to make the bronze crown of the sacristy in the video