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. 
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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? 
The following hardware accessories are compatible with Square Stand. All hardware connecting directly to the Square Stand but will connect to the stand via USB. Note that with Square Stand you can use either a cash drawer that plugs into the receipt printer or one that plugs into the USB block of the Square Stand. We recommend using the printer connection since the printer connected cash drawer is simpler and less expensive than the USB version.
Be sure the printer and the iPad are connected to the same network. To confirm this or change your Wi-Fi network, go to the iPad’s Settings and tap “Wi-Fi” located in the left sidebar. Then select the network that the router is broadcasting and click “Connect”.
Drawer made from robust Steel. 1 x Cash drawer with RJ11 cable. Thermal Receipt Printer. THERMAL RECEIPT PRINTER. Pre-wired with RJ11 cable, plug for connection to receipt printers, compatible with Es…
I haven’t yet seen a receipt printer that is airprint compatible though, allowing more apps to use it. While credit card acceptance and sales apps would obviously benefit, I can imagine a number of other uses for a small printer that prints bits of disposable information. The daily forecast, sudoku puzzles, today’s schedule, todo lists, etc, for those who have to share their iPad with a spouse or children, for instance.
An update 11/21/15 Had it working fine with Amazon local register until Amazon shut it down, so bought the PayPal chip and card reader- the updated paypal iOs app will not print to this printer. (iOs 9.1/ iPad 3). The workaround I found was to turn this printer in to an airprint printer- it’s a bit of a hack, instructions are out there, problem being you must have a host computer on the network. To be clear- this is a PayPal issue- not a fault of the 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…
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
The printer that Square supports is one of the largest used brands in the receipt printer market.  They are not getting kickbacks on printers as the printers are sold by hundreds of places including Amazon, and the buyer doesn’t know you are buying it to print with Square as the printer is also used by 100s of other POS systems. More printer options would always be better, but as this is one of the industry standard printers it only makes sense they support it.
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Star Micronics TSP100 futurePRNT is the first all-in-one receipt printer. Yes, all the parts and software are included in one box. To get you setup quickly, we’ve included an internal power supply, interface cable, power cable, complete mounting kits and a paper roll. To bring you the future of receipt printing now, we’re also including a full set of software utilities. Redesign your receipt without modifying your application. Add your logo. Add coupons. Preview receipts and enhance bar codes. Included operating system drivers allow for ‘Plug & Play’ automatic installation.
If your customer entered an email address to receive a receipt from a Square merchant in the past, they may already be opted in to automatic receipts. These customers won’t be asked to enter their contact information after a sale, and a receipt will automatically be sent to their preferred email address. 
Star Micronics TSP100GT Fast, reliable thermal printing is a snap with the Star Micronics TSP100GT. This printer offers additional configuraiton, including embedded graphics and logos, adding flair to retail receipts. The TSP100GT supports iPhones as well, giving you an option for receipt printing with your mobile POS installation.
Square systems are primarily compatible with Ethernet or Bluetooth interface printers (depending on the tablet you are using, Android tablets with USB ports and USB On-The-Go or USB Host mode can use USB interface printers). The compatible printers for Square systems are as follows:
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)
I kept the static method I’d written for having a single, unique lock and changed it to create a single, unique dispatch queue. The static method, however, introduced a new issue I’d overlooked: upon logging out of the app, the queue would persist while the code blocks it ran tried to access deallocated data. This new issue finally pushed me to use an even higher level concurrency abstraction, NSOperationQueue (see Apple’s documenation for more details). NSOperationQueues are built on top of GCD but provide several extra features, including the ability to cancel operations. Moving printer communication code to an NSOperation subclass was a small amount of extra work that paid big dividends. By storing the operation queue as an instance variable on the print controller, I was able to cancel all waiting printing and printer discovery operations and deallocate the queue itself in just a few lines of code.
@SSmobile @Kevin7 – I went ahead and moved both of your comments over to the thread where we are tracking this feature request. I totally understand your frustration and desire for Epson support. They make a mean printer that is also a fraction of the cost of most Star printers. I have personally passed this feedback along to our product team, and expanding compatibility is something that is top of mind for them. I’ll update this thread if/when this functionality is added in the future! 
Thermal Printer Features: 100% brand new and high quality Suitable for all types of commercial retail POS systems Light in weight and smart in shape High-quality printing and low cost Low noise and h…
There are several reviews of this product, and the unit is physically about the size of three iPhone 4 stacked in a neat pile. It is intended to support between 7 and 10 printers before you need to buy a second device. I am not clear whether you can set this up from iOS, but it works well once you have it set up.
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.
@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. 
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
GOOJPRT PT – 210 58MM Bluetooth Thermal Printer Portable Wireless Receipt Machine for Windows Android iOS. – With Bluetooth 4.0 function, support Android, iOS and Windows, convenient for you to print …
Generally speaking, the Star printers will just show TSP100 on the front of the actual printer but those are the model numbers; it is kind of confusing. Feel free to share a link or two to the printers you’re viewing, I’d be happy to confirm. 
As a bluetooth only device, it is a bit glitchy. If you are wanting to use it with a phone/tablet only as a standalone device, look elsewhere. The miura m010 reader works great for this, though is unfortunately not available on amazon.
** 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.
As VanKalkerFarms answer states, Point of Sale is not compatible with standard desktop printers at this time. A possible solution might be to view your receipts on your online Dashboard after the transaction is complete and you can print them from there on a desktop printer. 
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The free Square Dashboard app works in sync with Square Point of Sale and lets you view your live sales data in seconds. You can access powerful analytics, and easy tools to help you track and improve your business.
Square Point of Sale on an iPad is compatible with a wide variety of third-party hardware accessories. Below, you’ll find a list of supported accessories, where to purchase them, and information on getting set up.
It has 5 bill trays, 5 coin trays and a bill entry, keeping your money organized and largely improve your working efficiency and accuracy. There are 5 bill trays and 5 coin trays, with a bill entry, y…
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.
Did you just purchase a Square Stand or have the Square Register app running on your Android, iPhone or Tablet and need a Receipt Printer or Cash Drawer Hardware Bundle? There are a few different models and options for you to choose from when selecting a Thermal or Impact Receipt Printer and we will go over these here. We will cover other popular POS apps like Shopify, Breadcrumb, Shopkeep, PayPal Here and Clover in upcoming articles.
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.
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.
EOM-POS Thermal Receipt Printer- USB, Ethernet, Serial Ports- Auto Cut – Cash Drawer Port (RJ11/RJ12)- Paper Width 3 1/8″ (80mm) – NOT COMPATIBLE with Mac, Square, Shopkeep, Clover, Shopify, or Paypal