A project at work led me to be curious about whether the techniques of 3D scanning and printing could profitably be employed in organ building?
There must be many cases where a restoration of fiddly legacy/non catalogue parts in old electric or pneumatic mechanisms is required.
Previously this could have caused a problem, but now it is possible to scan an existing part with a laser scanner, (or design in a cad tool) and then to cheaply make as many copies as you want in nylon, resin, and other synthetic materials, perhaps rapidly going through design iterations to ensure a better fit. It seems to be possible to come up with just about any shape.
Any use in organ building? I suppose many components are rather small, and so resolution will be the limiting factor. Another murky issue could be that of infringing the unregistered design right of another manufacturer (by copying their part), but since most obsolete parts will be over 15 years old from the initial design, this probably wouldn't be an issue.