How do you turn your 3D plastic printer into a food printer? You just print the required parts.

Before you go to the hardware store — or book a contractor — you can use software like free floor-plan apps and augmented-reality tools to sketch out ideas for your remodeling projects.

Engineers have developed a new way to 3D-print liquid and solid materials together, potentially leading to more dynamic and useful products—from robots to wearable electronic devices.