In January, Nokia released design files allowing owners of 3D printers to make their own custom-designed cases for the flagship Lumia 820 handset. In February, the Lumia 520 joined in the fun when the CAD files for its shell were also released. 3D printing still being in its infancy, I don’t think it was ever intended for anyone other than hobbyists but it’s nice to see to ability of some phone personalisation. Have any of you managed to print the case out? And possibly more importantly; has it been durable?