for silver, they look nice. now i can order them. and the future could also see more choice. 3d printing now is a technology where you can print in more than 15 materials. so in the future we will print goods, frames, in transparency material, in bio material, in metal material. so we are at the beginning of this industrial revolution. the aim here is what's being called mass customisation — where by making lots of personalised products, the cost can be kept down. and although these glasses do start at £160, which is similar to many others on the shelves, that rises with some of the options. but beyond all of this, and the sustainability element, for this to really work, the finished product needs to prove to be