FitCheckr

FitCheckr is a web + desktop app that helps makers and small hardware teams validate whether a prototype will physically assemble before they spend time and money. You import simple CAD exports (STEP) or even rough meshes, then define key interfaces (holes, bosses, fasteners, clearances) with lightweight rules. The app runs automated fit/clearance checks, flags likely collisions, and generates a build-ready checklist (tools, fasteners, tolerances, order of operations). It also supports “shop reality” notes: printer shrink, laser kerf, CNC tool radius, and off-the-shelf part variability. This is not a full CAD replacement; it’s a pragmatic preflight layer that sits between design and fabrication. The goal is fewer wasted prints, fewer re-cuts, and fewer late-night reworks caused by obvious-but-easy-to-miss fit mistakes.