This is just a really quick model I threw together to enlarge my 35mm negatives. I couldn't find any negative carriers for 35mm online. This could probably use some refinement…
Print using whatever settings you normally do, these don't need to be super strong but there's not a ton of infill anyway. the holes and pegs may not fit initially and you might need to bore them out a bit with a knife or scissors.
The author marked this model as their own original creation.