I can build the 3D "STL" files for the 3D printing. I can take all the measurements from the pieces that are intact and digitally "correct" them.
Most 3D printers (mine included) leave ridges from the individual layers. They can be sanded and painted, but it's extremely time consuming.
There are a total of 18 pieces, 14 are identical (fins). The center fin has an extension for adjustment, then there is the rail that tuns them all in unison, the housing the fins sit in and the final drum that all this fits in and ultimately fits into the duct opening.
If anyone has something better than a "regular" PLA type printer I'll be happy to post the files when they're done and perhaps we can all help each other out.