You could look into an opensource project like https://en.openscan.eu/ depending on how "small" these parts actually are.
It requires some initial printing as well as some hardware kit purchases (provided) for the servo and controller board, but I saw a demo on youtube once that provided surprisingly good point cloud accuracy from one of these OpenScan pedestals. Good enough that you could probably generate smooth surfaces from them and make a usable part with minimal model post processing. And definitely better than you'll ever get from a freehand smartphone/iPad scan.