I've been on a roll designing film holders for 4x5 and 5x7 that can be 3d printed. I think the most difficult challenge is what I refer to as the pressure plate, which puts pressure onto the dark slide at the opening. The difficulty is making a design where you can install felt at the opening for a light seal, then installing the "pressure plate" over it to hold the dark slide against the light seal. I ended up designing a cap which slips onto the end and over the felt and that seems to work well with 4x5 and even 5x7.
Which brings me to 8x10. Using the dimensions from https://lf.animaux.de/filmholders , I designed an 8x10 holder with the same end cap as the 4x5 and 5x7 holders. Because 8x10 holders are quite large (296mm on end), and most 3d printers don't print that large, I cut the main body into two and put a tongue and groove into the body to help make it stronger, as well as an overlap on the side to help seal out light. If you orient the holder at 45 degrees on the 3d printer plate, it should fit within a 220mm square build area (Ender3 V3). I've printed film holder rails in the past at 45 degrees and the extrusions are smooth so it works fine (I still use 5x7 holders printed this way).
I would recommend printing as strong as possible: 4-5 walls and 100% infill. My slicer says it will take 450g of filament! So estimated cost of around $10. Even on my bambu printer, it estimated 14 hours, so I haven't printed it yet. If anyone wants to try, it's on thingiverse: https://www.thingiverse.com/thing:6289831
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