If you've printed enough enclosures, you've seen it happen: a perfectly sliced print finishes, looks flawless on the bed, and then twenty minutes later the corners have lifted, the walls have bowed, and what should have been a flat-sided box now looks like it's trying to curl into a smile. This is 3D printing warping, and it's one of the most common — and most misunderstood — failures in FDM printing. Most people blame the printer — a loose belt, a drafty window, "bad" filament. Sometimes...

Snap-fit joints are one of the most useful tools in a designer's toolkit. They let you join two parts without screws, adhesives, or welds — just a bit of elastic deformation and a satisfying click. For 3D printed parts, snap-fits are especially valuable: they reduce assembly time, cut down on hardware costs, and allow enclosures or assemblies to be opened and closed repeatedly for maintenance or repair. But designing a snap-fit that actually works with 3D printing is trickier than it looks....