This design has been kicking around in my head for a couple of months. I finally got around to building it over the weekend. It took several iterations to get things working right, and I thought about scrapping it when I couldn’t get the sliding top to slide easily enough. But I’m kinda stubborn, and I finally figured out how to make it work.
Here’s a one-handed video of it sliding (the camera didn’t rotate, sorry!):
And of course, Gkid needed one for the engraved pink pencils she requested:
UPDATE: The pattern and instructions have been posted over in free patterns: Living Hinge Pencil Box Pattern