We have the Brother Intellifax 770 fax machine. One day, in the midst of receiving a multiple page fax, I inadvertently stumbled upon another green/savings trick.
Dang, the cartridge ran out, and oops I had no replacements left. Desperate and willing to try anything, I simply rewound the film back from one side of the cartridge to the other and re-inserted it into the fax machine.
It worked like a charm. Yowza! Since then (not that I receive billions of faxes by any means), I've been using each cartridge 2 or 3 times. It takes awhile to rewind the film, but if you do it while you're sitting in front of the TV, it's no big deal at all :)
This is the fax machine:
Here's the replacement thermal roll:
This is the cartridge that the roll attaches to:
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