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Picture of Hacking a Brother 440CN multi-function printer
This type of printer guzzles ink. Ink guzzling printers are only friendly when you can afford its drinking habit at around $20 a cartridge (genuine). Which is why this Instructable will show you how to trick the sensors in the printer into thinking that there's a full catridge of ink when there really isn't!

Note: I learnt this trick from this forum. I am posting an Instructable for it to clarify the instructions with images. I do not take credit for discovering this hack at all.

Step 1:

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Open up the lid and remove the three screws.