Welcome to another installment of every tech-loving optimist’s and misanthrope’s favorite look at the week’s most wondrous and pitiful new gadgets. We call it “Gadget Dreams and Nightmares.” Ahead, for your delight and dismay, are studies of a wearable walkie-talkie-type communication device, a 360-degree action camera, a tiny 3D printer, a smart camera attachment, and…