The refilled cartridges worked for a little while (10 pages or so) just fine, then the ink went dry and also spilled inside the printer. We did not fill the printer with “after market” cartridges. We just injected the ink into the correct holes. (We have an HP Photosmart C3100 series printer).
Did HP program the cartridges to “fail” when the printer somehow discovered the ink was replaced, instead of the cartridges? They are making a bloody fortune from these cartridges which don’t last long at all.

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