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Hacking your Adafruit Mini Thermal Receipt Printer

bigprints

Look at those huge, razor-sharp image prints! You want some?

We’ve discovered that many of our thermal receipt printers…at least anything shipped in the last year or so…have a hidden capability, hardware handshaking…allowing an attached Arduino to run the printer at full-tilt. Pages feed fast and smooth, huge bitmaps don’t become garbled due to buffer overflows.

This does require a late-model printer (looks like firmware versions 2.64 & 2.68 support it, but perhaps others too) and a little bit of surgery. It’s a simple modification, just soldering on one wire, but this is a warranty-voiding procedure and might not be for everybody.

You can read about the hack in our Mini Thermal Receipt Printer guide on the Adafruit Learning System.



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