Actually I don't see 3D printed holders as saleable objects, it is definitely a DIY thing. The current hobbyist printers probably don't have the required resolution but the commercial ones are definitely there. The big difference is that film holders are almost all identical save for the dimensions, so that once you have a model made for one size it should be trivial to alter it for another size. All this assumes that a suitable plastic is available.
Looking at a Fidelity 8x10 holder, the parts list would be 1 x centre divider (cut from sheet), 2 x dark slide (cut from sheet), 2 x dark slide handles (2 pieces each, printed), film holder body with integral film guides (2 identical pieces, printed), 2 x end flaps (printed), tape for end flaps, glue for assembly. Putting that together wouldn't be rocket science, it wouldn't even be stone axe science.
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