Every unit is different. Every unit needs checking.

Hand-built and made-to-order products vary. One unit may share a layout with the last but still differ in a dozen places. Intelligent Inspection that compares an image against a reference unit struggles here, because it cannot tell an acceptable difference from a real fault.

At low volumes, there are also rarely enough sample images to teach a vision model what good looks like. And in a dense assembly, features hide behind other features, so a camera fixed in one place cannot see everything it needs to.

This is the problem in high-mix manufacturing, where products are high-value and low-volume, and no two builds are quite alike. So the check often falls back to people. It is slow, it varies between shifts, and a missing, misplaced or wrong part is easy to miss by eye.