If anyone else here was wondering, as I was, what the heck 'nano injection moulding' was:
The grain structure of conventional steel tools has placed a lower limit on the size of features than can be injection moulded. Using metallic glasses to make injection molding tools, one can cheaply produce plastic objects on the centimetre scale, with sub-micron surface features.
"Micro-injection molding is widely used to form plastic components rapidly and precisely. Current tools for injection molding rely largely on steels for their strength and durability. The finite grain size in traditional crystalline metals means it is challenging to produce tools with features < 10 μm (Fig. 1b). However, the need for plastic components with increasingly smaller features is recognized, particularly for information storage and bio-analytical applications.
"Bulk metallic glasses (BMGs), having no limiting microstructure, can be machined or thermoplastically-formed with sub-micron precision while still retaining often-desirable metallic properties such as high compressive strength. These novel materials thus have enormous potential for use as multi-scale tools for high-volume manufacturing of polymeric MEMS and information storage devices. Here we show the manufacture of a prototype BMG injection molding tool capable of producing centimeter long polymeric components, with sub-micron surface features."