> The support for using a camera on the spindle is fun, though also fiddly. Once calibrated, it can be used to find the position of features, in order to set a zero position, or even correct for rotation. In theory, this offers a nice workflow for making double-sided circuit boards, by isolation routing and drilling the first side, and using the drilled holes to align the second side.

Drill two holes in base plate with known distance, then drill the same two holes in pcb. Mount board with some steel pins. When you need to rotate, you have reliable indexing.

This combined with the "3d printed vtol drone" from yesterday is certainly an incredible set of feats for amateur manufacturing.

I like this technique for prototyping and one-off circuits a lot. Thank you for sharing. I may throw together a similar device.