Have not purchased this printer, but wanted to let people know that this is not the only printer that will work with Square. I have two Star Micronics printers, one Ethernet and one Bluetooth and both work fine with the Square app for iPad. I also have Ethernet based cash drawers that connect through the printers and those works just as well. This probably has the easiest set up, but it is not the only way.
SM-T300i Mobile Printer (SM-T300I2-DB50 US GRY), 3-Inch Print Width, Bluetooth 2.0, Serial Interface, (Includes Serial Cable, Battery Pack, AC Charger, Sample Paper Roll), Color: Gray (Part Number: 39634010)
The cash drawer connects to your receipt printer, and is triggered to open when you finish a cash or cheque sale and the receipt is printed by the printer. A manager or admin can also manually open the cash drawer directly within Vend.

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Please help! I ordered a pos hardware bundle from Walmart.com and it’s not recognized by My square stand! Is there a way of “tricking” square stand into recognizing my usb receipt printer and cash drawer?
Hi @McNabbGames — I went ahead and combined your thread with another seller’s who had a similar question. I can assure you that we’re always looking into more affordable hardware options for our sellers. As for the technical explanation, from my limited understanding (I’m not an engineer), each printer manufacturer has a specific driver for their hardware, and since manufacturers don’t build printer drivers for Square Register, we would have to build one for each printer model – which is something we don’t have the bandwidth to do. 
Last but not least, though I’m enough of a geek that the code itself would have been interesting and fun for me, it was really special getting to see first-hand how the product truly helped people. Meeting a merchant who had previously only been able to give out handwritten receipts, handing her a Bluetooth printer, and seeing how our new feature would make her job easier was the highlight of my summer.
STAR MICRONICS 39336532 SP742ME Receipt/Kitchen Printer, Impact Dot Matrix, 4.7 lps print speed, ETHERNET Interface, with AUTO-CUTTER and Internal Universal Power supply. Order Printer Cable Separately. Color: GRAY (replaces 39336531), 39336532 $367.23 $274.06
If you want a small and easy to carry receipt printer, this may be it. It weighs less than half a pound. It is easy to carry around. For people who sell at craft shows, farmers markets and historical fairs this may be the receipt printer.
My first inclination, having just taken a class in C++ using pthreads, was to simply use locks. I created a shared NSLock through a class method and locked before listening and printing, as described in Apple’s Threading Programming Guide. I was excited when it accomplished the mutual exclusion I wanted, but my coworkers were less thrilled about using such a low-level solution given the higher level abstractions available in iOS. In search of a higher-level solution, I replaced the global concurrent queue on which I was running the printer code with a serial dispatch queue, allowing only one block to be run at once. I was getting warmer, but my new solution still raised some concerns.
Receipt Printer Compatible With Square, A cash drawer needs to be linked to an invoice printer to open immediately. Otherwise, you’ll have to buy hand open the drawer utilizing the money drawer secret. * This standard money drawer is not able to link to an invoice printer.
Send invoices free from your Square Point of Sale and get paid faster. Customize your invoices, set up weekly or monthly recurring invoices from your Dashboard, and let customers pay online with a credit or debit card. Invoices are free to send and cost 2.9% + 30¢ per invoice paid online.
This video, from http://www.beaglehardware.com, describes how to connect the approved printer and cash drawer to Square Register. With Square Register, you can print receipts for your customers at the counter. Connect to a cash drawer to make change for customers and store cash. The cash drawer will automatically open when connected to a supported receipt printer for every cash transaction and refund on your iPad or Android device.
If you are using your iPad or iPhone by itself with the Square app, you will not be able to use a USB Star Micronics Printer. You will need either a Bluetooth Receipt Printer, or Ethernet Receipt Printer. A good reason for going with Ethernet, is that you can have multiple devices print to one printer. If you are using an Android device, you can use either an Ethernet Receipt Printer, or and of the USB Receipt Printer stated above as long as you use the USB OTG(on the go) adapter. Please note, Bluetooth is not currently supported on Android for Square. 
Square introduces more ways to engage with customers. Square now integrates with cash drawers and receipt printers. With a single tap on an iPad, you can open your register’s drawer to complete a cash sale or make change. Please read the options below carefully before purchasing a cash drawer.
Square Register Socket 7CI Bluetooth Cordless Hand Scanner (CHS), Socket Mobile CHS 7CI Cordless Barcode Scanner, 1D Imager, Includes Socket CHS 7CI Barcode Scanner, Two AAA NiMH Rechargeable Batteries, USB AC Charging Kit, Lanyard/Belt Clip with Retractable Tether, Dark Gray Color – CX2870-1409
I don’t have any personal use of this but this item says it takes usb input and converts it to the connection that would come out of the printer from what I understand.  It may work, it may not.  There are no reviews that are helpful of the product.
Bluetooth desktop receipt printer. Star printer, TSP654IIBi2-24, is the Bluetooth printer model which is one model in the TSP650 series of printers. TSP650 (654II), thermal, auto-cutter, Bluetooth iOS…
These receipt printers are certified to be comaptible with Square Reader and Square Reader software for iPad, iPhone and Andoid.  Contact us if you have any questions about which printers, cash drawers or other components will work with your Square Reader application.  Get your business or store online today!
( FREE 58mm Paper Roll is included!). Support Cash Drawer driving, connect cash drawer with RJ11. Connector Cable(RJ11 cable is not included.). Drawer made from robust Steel. ★★★★★. 1 X Cash drawer wi…
Note that you may connect a barcode scanner via USB cable to the Square Stand, but if you are using an iPad without Square Stand, the barcode scanner must be a bluetooth barcode scanner. For more information on the correct bluetooth scanner to use when connecting directly to an iPad, click here.
Bluetooth printing was a great project — it brought many unique engineering challenges and taught me a lot about how Square’s code base works. I’ve always been taught to use inheritance when possible to organize and share code, but working with the peripheral class hierarchy was a strong reminder of just how valuable a good, well-organized, object-oriented architecture can be. There was a lot of shared code between WiFi and Bluetooth printers that I could have copied and pasted, but I’m glad that I took the time to not just make it work, but to do it right. I’m thankful that my co-workers pushed me to take the time to experiment with different abstractions of concurrency. Not only is my code better, but I now know many ways to approach the problem. In software, there’s rarely just one solution, and this is a good reminder to explore every possibility before choosing one — because it was the first idea that seemed to work.
I’d like to take a step back from discussing integration challenges to mention a few examples from the Square Register code base that made my life easier for this project. The code separates operations looking for connected peripherals and interacting with them and uses abstract superclasses to provide a consistent API to the rest of the app. Because the code was so robust, my new printer code fit well into the rest of the app, and existing code used by other printers fit well into my own new code. One good example is our receipt image renderer. The renderer works by putting data into an HTML document styled by CSS, rendering that HTML into an unseen web view and then rendering the view into PNG image data that can be sent to the printer. The HTML and CSS scale to fit different-sized windows and thus are a good generalizable solution for multiple print widths. All of the printers that we had previously supported (WiFi and USB printers) printed three-inch wide receipts. However most of the Bluetooth printers I worked with use two-inch wide paper. Thanks to the flexibility of our renderer, all I had to do was set the correct print width of a printer and voilà — the receipts were seamlessly resized and looked great.
A simple print button on the tablet application would allow us to connect to a local or network printer and print the same form data. Why is this still impossible? Why can we still not utilize our desktop or local printers to print receipt data from the app? 
You may plug a receipt printer into one of the three USB ports found on the Square Stand accessories hub, but kitchen printers are typically located some distance away from your checkout register – farther away than a USB cable will reach.
First and foremost, a little background info: I own my own business and have been using the Square Register POS system for over four years. I have a different kit, but they’re all similar products. When my friends decided to open their restaurant, they went with an old school cash register and struggled at the end of the night with keeping track of taxes because it was not as intuitive to use. I convinced them to order this kit from Amazon and the other necessary items elsewhere and helped them set everything up in less than 30 minutes. This kit provided an excellent, trusted printer and an easy to connect cash drawer. Upon arrival, I had an issue with the cash drawer – it would not open. A quick email (on a Sunday) to the seller, and he gave me advice and a link to an explanation as to how to fix the stuck drawer. Using his explanation took me a couple of minutes to fix it. I am a realistic person, and I understand that things don’t always go as planned, so I was happy the seller worked with me fast to come to a solution. I gave this five stars because of the customer service – you can find similar products elsewhere and they all work the same way… but the customer service provided made this an excellent purchase! Thanks EOM-POS!
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If you need a remote Kitchen Impact Order Printer, the Star SP742ML or SP742ME will work for all applications. It is a Dot Matrix Receipt Printer and uses a ribbon, so you can print on carbon copy paper rolls, or standard single ply :
It is a simple process all I can think is that square gets a percentage of royalties from their supported printer sales and thats why they are locking everything down to these ridiculously overpriced pieces of equipment. 
@usascottwright – While we don’t currently support Epson printers, it’s definitely a popular feature request. I’ll update this thread if that changes in the future! Also, apologies for the delay in following up with you. 
A printer-driven cash drawer must be connected to an receipt printer to open automatically. Otherwise you’ll need to manually open the drawer using the cash drawer key. A USB cash drawer (requires Square Stand) will open automatically when connected.
September 30, 2016 • Android Receipt Printer • Mobile Bluetooth Receipt Printer • Refurbished Thermal Printer • Square Compatible Receipt Printer • Square Hardware Bundle • Square Kitchen Order Printer • Square Stand Printer
Star TSP650II TSP654IIBTI Printer (Bluetooth Interface / Auto Cutter / Dark Gray). Sorry No Drivers cd included. drivers can be downloaded from Star Micronics website. Setup is pretty simple. Press an…
The Ethernet printers compatible with Square Point of Sale are thermal printers. They require heat-sensitive paper and won’t work with non-thermal receipt paper. These types of printers aren’t ideal for kitchens or high-temperature working areas. 
If you’re not satisfied, neither are we. Bottom line, we want you happy! We will make every attempt possible to resolve the issue if we made a mistake. (It happens). Let us know if our service could b…
** If you are using the Square Register app, this is the USB version of the Star TSP143 Printer and must be used with the Square Stand Hardware. You will need a Star ethernet or bluetooth printer if you are using Square or a similar Point of Sale app with the tablet or device by itself.
The new Square Contactless and Chip Reader is included so you can accept every way your customers want to pay. Place the reader in the dock, connect the dock to the USB hub, and you’re ready for business. Accept magstripe cards, chip cards, and NFC payments like Apple Pay.