Andrew Walker from The Independent has written an excellent piece explaining the fallacy of the 3D Printed gun, and why D2W were prepared to print one for the V&A.

http://www.independent.co.uk/life-style/gadgets-and-tech/features/why-all-the-fuss-over-the-vas-3dprinted-gun-its-a-symbol–not-a-threat-8829999.html