Dovetail slide-top box

A small box with a sliding lid that runs in dovetail grooves along its long walls, like a classic wooden pencil box. The lid slides in over the low end wall, closes flush with the rim, and clicks shut on an optional detent; a row of shallow grooves gives your thumb something to push on. Set the inside size and add cross dividers for small parts, then tune the slide fit and detent for your printer. Both pieces print flat with no supports: the box open side up, the lid underside down.