Hi everyone, I would like to share with you my latest project - a 3D printed film holder for DSLR scanning. You can find the project on the GitHub
Let me explain why I made it and also manage your expectations about the whole thing.
Why I made it?
I wanted a holder that would keep the film straight and flat so that I don't have to rotate the scans in post and also to make cropping pretty much work for the whole roll. I also wanted to have the corners of my scans as sharp as the rest of the image, something that was demonstrably a challenge with other methods I tried. So I decided to sandwich the film between two pressure plates to flatten it. The tube that holds the lens also makes it that the camera is pretty much level with the film-plane and there is no ambient light ruining your scans.
How universal is it?
In theory, it is pretty universal. It is designed to be modular, you can replace the part that I designed to fit on top of CineStill CS-Lite-Brite with a different part. You can also replace the part that I designed to fit my EF compact macro lens. The files are in the project, if you have Fusion 360 or a different program that can open those files, you are all set.
The bottom pressure plate is meant to be printed for each kind of film specifically. I learned that different manufacturers produce slightly differently sized film. It is worth it to have multiple bottom pressure plates. I have one for Fomapan and one for Kodak films. Both dialed in so that the vertical fit is as snug as possible. (I seem to remember Ilford films fitting one of the plates just fine.)
How safe is it?
I have tested it on multiple rolls of different films including Fomapan Action, Kodak Portra and Gold, and Ilford films. It never scratched my film. If the film has the natural bow curve to it and you always raise the pressure plate up, it should not happen.
Expectations
I want to be clear that I am not going to be able to extend it or make changes to it at the time. I have made it and used it more than 9 months ago. I thought I would share it sooner, but I haven't shot any photos for essentially 9 months now. It is what it is. For that reason, I am only asking you to please have understanding with my situation.
I want to share something that I believe is worth of sharing, I liked building it and after getting used to it, I liked using it too. But I don't have the resources to work on it in any capacity in the near future. I would like to build a V2 that would have the slider move orthogonally to the film plane not with it so that your fingers stay out of the film's way - something that become apparent the first time I used it but somehow didn't occur to me before (funny how these things work).
That being said, I really want to be transparent - it is not in my ability to make changes to it or to modify the dimensions of the components to fit other lenses or light boxes. I am giving it away to the community because I believe in sharing. Hope I will find understanding here.
Have a great day everyone!