tom said:

How much heat is being absorbed from the light source used for image capture?

I don't know the answer in this 35mm case, but my 16mm workprinter uses a standard decorative lightbulb - significantly lower intensity than a projector bulb because it doesn't need to project the film, just light it up. You can even leave the projector lit on a single frame without damage to the print. The more recent versions use LED bulbs that emit considerably less heat even than mine.

One common problem is due to very low humidity during the winter. This can cause temporary 'buckling' of film due to moisture loss at the edges, giving the film a cupped look when laid flat. If the print is stored at proper temperature and humidity it'll go away.

That is really useful information that I wasn't aware of and could be useful to me at some point. Thanks for sharing that. Although here in CA it is the winters that are humid, and the summers that are dry.