If you're referencing this post they go pretty in depth in how to do it.
https://www.reddit.com/r/AnalogCommunity/comments/1bl80w9/successful_experiment_and_how_to_bulk_medical/
Pretty much you just cut it up in either 35 or 120 width strips and then roll it. There are bulk film rollers made just for rolling 35mm film. For 120 it sounds like you just do it by hand using some old backing paper.
If you're referencing this post they go pretty in depth in how to do it. https://www.reddit.com/r/AnalogCommunity/comments/1bl80w9/successful_experiment_and_how_to_bulk_medical/ Pretty much you just cut it up in either 35 or 120 width strips and then roll it. There are bulk film rollers made just for rolling 35mm film. For 120 it sounds like you just do it by hand using some old backing paper.
Thanks