I'm using this with an Arduino Mega. There are all kinds of options available in Adafruit's library such as printing bold, wide, bar codes, and graphics -- but I'm just logging data, and simply sending commands such as Serial2.println(formattedString); and it works perfectly.You only need four wires! Power and ground: I'm using a 9v 1500ma wall wart; and serial TX and ground from the Arduino. You don't need to even use RX on the Arduino unless you want to receive error messages.I bought a box of 50 rolls of 2.25"x50' thermal paper here on Amazon and it's perfect.The printer comes with a couple of Y-shaped clips that will hold the printer to the front of a panel should you want to mount it. The wires come out the bottom of the printer so it's a little awkward to just set it on a table - I'm going to re-route the connectors out the back instead of the bottom.Also, although the Adafruit tutorial seems to say that you must use software serial, I'm just using one of the four built-in serial ports on my Mega. You only need software serial if your Arduino doesn't have any more hardware serial ports to spare.Printer works great, no problems and was able to get printing in no time. If you are having quality issues with your prints (faded or features not fully printing) I would recommend checking that the printer's power requirements are being met. I hooked it up to share a power supply with an Arduino mega with the recommended wall plug and adapter, and the prints were poor. Once I gave the printer it's own power supply it worked just how I wanted it to.I was able to get this set up and running in about an hour with an Arduino Nano. The example code and tutorial on the Adafruit site are spot on. I was able to design a 3D-printable case for it also, with space inside for a spare roll of paper and the controller board for power and Bluetooth connectivity.For those looking to get into this, the command set in all the Arduino-compatible libraries is pretty easy to use. It's not direct ESC/POS command set compatible, but I don't see that as a bad thing per se.Just make sure you have a power supply that can handle the current, as thermal printers do require a fair amount. I used a 9V 2A DC power supply and it does work nicely with it. If you use a 5V 1.5A, you may find it doesn't work quite as well.Don't buy this thing print nice for a couple of times connected to arduino, and after lets say 80 prints of no more than 10 cm printing text and codebar then suddenly starts doing weird things when feeding paper; it some time feeds backward and when printing paper doesnt feed at all.I contact adafruit and since the 30 day refund period was over they dont give me a solution and they have no clue on what happen with this printerThe printer is very easy to set up and prints just well. Be aware though that the package doesn't come with power supply and the power adapter (which is essential to power up the printer)!!Not very user friendly. So far we have not been able to get this printer to work with Raspberry pi. Haven’t gotten anything to print. Unsure if we are having a software or a hardware issue.Easy to set up and code using the tutorials online, works perfectlyIch habe das Gerät mit einem Raspberry Pi 3B mit Windows 10 IoT im Einsatz. Genau aufgrund dieser Konstellation habe ich mich für dieses Gerät entschieden, da ich es über die GPIO Pins ansteuern kann.Beim ersten Versuch (schnell, schnell anschließen) kam aber dann die Ernüchterung....es wird nur eine halbe Zeile geschrieben und die war nicht wirklich intensiv. Warum? Weil man ein dezidiertes Netzteil mit mindestens 5V und 2A nehmen sollte. Und siehe da, kaum gewechselt, schon kommt der Ausdruck!Auf der Homepage des Herstellers sind viele Infos wie zB das Befehlsset, das Wiring, Codesamples, etc. erhältlich....das hilft ungemein, wenn man den Drucker noch nie in den Händen hatte!Bin sehr zufrieden und werde ihn wieder kaufen, so ich einen weiteren benötige!