Serious Play Storage

From a measured LEGO brick to ten stackable containers in a week, one parametric model, a bit of tolerance chasing, and a lid that had to feel exactly right.

It started with a real LEGO brick and a set of calipers. Every dimension went into Fusion 360 as a parametric model, so the whole thing could be driven from one scale value, not just the outer shell, but wall thickness, stud size, and the recesses underneath. That was the fiddly part: scale a brick to 200% and the fit stops working unless the internal geometry scales on its own terms. Getting that math right meant the final size could stay an open question until the end.

The first print was deliberately small, a look-and-printability test, far too small to hold anything. From there it was a matter of scaling up until the set fit inside and the brick still felt right in the hand. Not too big, not too small. Then the stacking: the underside needed proper recesses for the studs to seat into. First fit was too loose and a stacked tower came apart the moment it was picked up. One tolerance adjustment fixed it.

The lid took the real attention. Too loose and the brick falls open when you lift it; too tight and opening it becomes a chore. It landed somewhere better than either, lift the top and the air inside slows it down, so the lid separates gently over a few seconds. Like opening an iPhone box. Small cutouts at the bottom edge let you grab the base and speed things up when twenty seconds of suspense is too much. Two prints total to get there.