Apparatus and methods for industrial-scale production of metal matrix nanocomposites are provided. The locking member is positioned on the upper housing to release or lock the cover. Some of the strut members can have a nesting feature configured for nestingly receiving another strut member when the endoprosthesis is in the delivery condition. The plurality of optical elements are positioned to direct the light beam from the light source to the receiver, which is positioned to receive the light beam supplied by the light source.