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 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. 
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)
Another nice touch is that they include a CD which allows you to customize the printer (add logos, sync with POS systems, custom data to add once the receipt is printed, etc). Keep in mind though, this customization works with certain POS systems, not all. On Square, I can’t tell the printer to print out all of the extra stuff since the POS for Square is very simplified.
Pos thermal printer with high speed and advanced technology. Or add greetings as well! Works with all pos softwares. easy installation and if you prefer, TPG technicians will walk you through on how t…
Pay Pal says this is compatible, but the few reps I have spoken with are not really familiar enough to guide me through. My LG Optimus phone runs T-Mobile 4g. I connected stand alone router(LAN?) to printer. I am guessing there is a conflict and I need to disconnect 4g or whatever wifi is connected to phone in order to pick-up signal from LAN router, assuming I can’t receive two simultaneous signals. That would disconnect me from Pay Pal transaction. Don’t know what I missing,but so far it’s a lot of wasted time and money. There’s no customer service that I can find with printer and the user guide is scant. I’ll take another look at Star website, but don’t expect to find a solution there. A USB connection would have likely prevented many issues/
( 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…
Star Micronics TSP100Receipt Printer is the first All-in-One receipt printer on the market today!. The advantage of TSP143LAN Receipt Printer is evident for applications such as retail, restaurants, and convenience stores. TSP143LAN Receipt Printer is provided with all standard operating system drivers (Windows, Linux and Mac) and specialty drivers such as OPOS and JPOS. The printer is also directly supported in Square Register. Star has also included a number of embedded simple utilities that will enhance Retail or Hospitality CRM in POS applications and therefore make the entire experience simple. These printers come complete with every thing you need including printer, power supply, Ethernet cable, wall bracket and a roll of thermal paper.
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. 
Most receipt printers I have seen use a wired ethernet connection, so you could add a slick Lantronix xPrintServer which uses AirPrint to avoid needing a computer running for your iOS devices to print to these specialized printers.
Complete your countertop POS system with this Square register kit. Print paper receipts, daily sales reports and summaries right from your iPad. Includes, Square reader, Star Ethernet Printer, APG 13″ Vasario Cash Drawer, drawer cable, extra 2 rolls of thermal receipt paper and installation support. 
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.
Square Register Kitchen Printer, Star SP742ML (LAN) Ethernet Interface Receipt Printer with Auto-Cut and Internal Universal Power Supply, No Interface Cable, Charcoal/Dark Grey Color, SP742ML-GRY – 37999320
Overall, this is a great printer. I can’t complain about the price because for similar thermal printers, this is relatively cheap. Any cheaper and there are issues with printing mechanics and whatnot.
This printer is fast. Thermal printers print very fast, and the internals are actually much simpler than the ones at my work. You simply open it up, drop the paper inside (yes, it’s a drop in, which makes it much easier to replace the roll once it has run out) and then feed the paper over the top.
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…
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.
When you connect to the USB Receipt Printer or Ethernet Receipt Printer with the included cable, the cash drawer will open every time you complete a cash sale. Or use the included keys to manually open.
If the email address entered for receipt delivery is no longer active or is incorrect, Square will need to unlink this information from your customer’s payment card. Have your customer contact us for help. 
POSGuys.com Square Stand POS Kit The Square Stand point of sale kit leaves the guess work out of purchasing compatible hardware that is reliable and looks fantastic with the Square Stand. These kits are designed for customers who need every part to just a few pieces to make a complete Square Stand register.
I already had the square reader and just was tired of it being in other spots or being charged. The dock was a great addition to the square stand and the printer. Very easy to use. Just attach to the square stand and put the reader in. The dock has weight to it so i dont have to worry about it falling especially in the spot i put it. Definitely reccomend
Mini Bluetooth Printer is a portable thermal printer that combines USB, RS-232 Serial and Bluetooth communication interface together. Support IOS Android. It can print 58mm width thermal paper. Ther…
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.
Great product and great company to work with. I at first ordered the TSP143U which is a USB Printer to work with a Tablet to set up a POS system at my business. Once I got it, I realized that if I had the printer plugged into the tablet there was no additional port to then charge the tablet. I contacted the company and they gladly accepted my return and let me reorder this LAN Printer. I highly recommend this vendor and their product.
But my point is that an adding machine paper-receipt looks unprofessional in some businesses.  An inexpensive ink jet or better, a multitasking network office printer that is already in use would make a LOT more sense for me.  I’m sure they are robust and work fine, they just don’t suit my business and I don’t like being so limited in the TYPE of printer I can use.
Thank you for your interest in this question. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
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.
*Note: We have had some Sellers complain about the receipts printing over too many pages when they want it to only print on one. The trick is to reduce the scale of the image within your printing options until it fits. (see screenshot)
I have a friend who runs a small shop and knew the Esky ES-CD01 Heavy Duty RJ-12 Key-Lock Cash Drawer would be perfect for his application. This drawer was a massive upgrade to the system he had been using. He had tried other drawers with different connections and designs, however this one was really the best.
Native Technology, Inc. is a third-party hardware reseller and is in no way affiliated with Square, Inc. Native Technology offers POS hardware that is compatible with the Apple iPad and Square, Inc. products. Square, the Square logo, Square Register, and Square Reader, are registered trademarks or trademarks of Square, Inc. iPad™ is a trademark of Apple Inc. iPod touch®, and iPhone® are registered trademarks of Apple Inc.
@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! 
Square Register Star TSP654 LAN Thermal Receipt Printer with Auto-Cut, Ethernet/LAN Interface, Dark Grey Color, No Power Supply, No Interface Cable – TSP654L-24GRY – 37999540 **TSP654L-24GRY has been Discontinued – Replace with TSP654IIE3-24 GRY**
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:
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…
Effect printers just print order tickets for a cooking area. They’re not impacted by heat and can stand up to warm environments. They need heat-sensitive paper and will not deal with non-thermal, invoice printer paper.
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. 
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…
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!
Square Register Star TSP100III Thermal Receipt Printer with Auto-Cut, Ethernet Interface 10/100BaseT (LAN), Internal Power Supply, Includes TSP143IIILAN, Power Cable, Ethernet Interface Cable, Mounting Kit, Paper Roll, Dark Grey Color – TSP143IIILAN GY US – 39464910
EOM-POS Heavy Duty Cash Register Money Drawer + Mounting Brackets for Under Counter Installation. Compatible with Square Stand [Receipt Printer Required]. Built in cable to connect to receipt printer.
For future reference, the price is $149.95: store.lantronix.com/product_p/xps1001ne-01.htm (It’s not listed on the page that is linked to, so it took me a while to get what you guys were talking about.) – Mathias Bynens Mar 23 ’12 at 17:21

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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 :
Buy Used and Save: Buy a Used “Star Micronics Monochrome Receipt Printer” and save 74% off the $690.00 list price. Buy with confidence as the condition of this item and its timely delivery are guaranteed under the “Amazon A-to-z Guarantee”. See all Used offers.
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.