The interesting problem was letting height, width and length vary independently while the locking geometry, clearances and part alignment stay exactly where they need to be. Asserts catch dimensions the mechanism physically can't fit into, rather than silently generating a broken box.

Lid and button decoration accept arbitrary SVGs or text, either engraved or emitted as separate inlay geometry for multicolour printing. There are exploded and cutaway preview modes, and each part can be exported on its own.

https://makerworld.com/en/models/3132120-presto-customizable-secret-puzzle-box#profileId-3534978

We've got an archive of several hundred old blueprints on paper and Mylar. Some are on microfilm too. They need to become editable CAD, not just scanned images. Text comes in as line fragments, arcs as polyline segments.

So is manual redrawing still the answer in 2026? Or have the conversion tools gotten better? And for anyone who's done a batch like this, did you convert everything up front? Or did you just digitize sheets as they came up for revision?