Here are some highlights of yesterday’s posts on TechCrunch Gadgets: And Makerbot Said: Let There Be 3D-Printed Shells For Pet Hermit Crabs Just Look At My Beautiful, Working Pocket Cannon Siri Gets Scary With ThinkGeek’s IRIS 9000 Monster Miles Davis Trumpets In-Ear Headphones Review Video: Japan’s Defense Ministry Develops Awesome Ball-Shaped Drone