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Just confirmed that this also applies to the Selphy CP1200 which Martin Merz previously confirmed...
The exact same gear in the exact same location..
When that little gear started to move over, pictures were starting to print out with some yellowing on the right side. This would slowly progress to the middle of the print.
Once that yellowing hit the middle of the print, then the printer would no longer detect a replacement print cartridge.
One little note to mention: When attempting this fix, slide that little gear only part way back, just a smidgen back. Use a very small dab of superglue on the very tip of a toothpick to just apply a miniscule amount of Super Glue to the shaft.. Then slide the gear back over the Super Glue all the way back to it's original position. This way you won't accidentally super glue gears to each other..