On Thursday's podcast, we chose Cubify as one of our favorite things at this year's CES: a 3D printing service that can turn almost any design into a plastic model 5 inches squared. The company has a bunch of its Cube printers here at the show — as shown in our hands-on a few days ago — and its team has been producing everything from shoes to chess pieces throughout the week. We thought we'd put it to the test, and gave them a challenge — could they print our Penrose-like impossible logo?