to buy (largely because most inkjet manufacturers discount the selling price of the hardware to make their money back on selling ink cartridges and photopaper). Today, many printers have an integrated scanner and fax machine, and are hence sometimes referred to as multi-function devices (MFDs) capable of printing, scanning, photocopying and sending a fax. Printing is also no longer just a flat, 2D process. Whilst yet to become a domestic desktop technology, 3D printers are now available from companies such as 3D Systems , Solid Scape and ZCorp . These allow a computer to output a physical 3D object in various plastics, resins or other materials, or even to print organic tissue! For more information on 3D printing, please see the 3D printing and bioprinting sections on ExplainingTheFuture.com . Other computer output hardware includes devices such as speakers (which can cost from a few pounds to several hundred) as well as Ipods and other music players that millions of people now use to extract music from their PC to listen to elsewhere. As with digital cameras (some of which are also music players!), in terms of a paradigm shift this is highly significant in that a personal computer is rapidly becoming a "digital hub" into which many of our most used hardware devices are only ever temporarily connected. In turn, one could argue that our computers are increasingly with us all of the time in the form of those hardware devices that travel with us, but which functionally depend on