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. 
Please note, these printers can only be used with iOS devices at this time. I don’t have a timeline for when they’ll be supported with Android devices yet. But I’ll report back when I have an update! 😀
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.
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.
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. 
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
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.
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. 
** 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 rest of the peripheral library code was also reusable. Admittedly, our deep class hierarchy was rather intimidating when I first came to Square, but it ended up being possibly my greatest resource in writing this feature. At the highest level, Register has a Peripheral class to model every hardware device we support. It includes common properties like manufacturer name, model name, and its connection state. At the next level down is the Printer class, which encapsulates printer-specific information like the kind of data it can print and its print width, as well as abstract methods for printing images and text. Having this infrastructure in place made the design of the Bluetooth printer class clearer, and provided a clean, generic API for the rest of the app to use to print images and text to any printer, leaving the low-level details of the printer communication to the subclasses.
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.
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.
Drawer made from robust Steel. 1 x Cash drawer with RJ11 cable. Thermal Receipt Printer. THERMAL RECEIPT PRINTER. 1 Fixed mount(1 Saddle stande with one turning axis, 1 Link pole with one Nut Sheath, …
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 :
I started off the implementation of Bluetooth printer support by using the same concurrency model used by our WiFi printer code and running Bluetooth printing and printer discovery blocks on a global concurrent queue. I quickly found what appeared to be a non-deterministic bug — sometimes I could print a receipt with no problem, and other times it would fail part way through. What I was in fact encountering was a timer firing and searching for connected printers while the app was in the middle of sending data to a printer. While this behavior was perfectly acceptable in communication for WiFi printers (TCP supports multiple simultaneous connections), it totally broke down in the new communication channel. It became clear that some kind of mutual exclusion was necessary to prevent this kind of collision.
This printer is terrible. It always has connectivity issues and it is constantly jamming. Worst mistake i made for my business. We have to keep it off until we get a customer otherwise it keeps printing no host receipts and it jams. Called star micronics they said it was probably an issue on my end. WRONG! MY other register, which is hooked up by same switch board, has an Epson printer and it gives no issues. Do not buy this printer for your business. Go with an Epson. Same amount of $, no problems.
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…
We are in no way affiliated with Square, Inc. 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. We are in no way affiliated with any of the brands or companies we mention in this website.
It has 5 bill trays, 5 coin trays and a bill entry, keeping your money organized and largely improve your working efficiency and accuracy. Electronic Cash Drawer There are 5 bill trays and 5 coin tray…
@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. 

Home Page
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.
Don’t forget, we also sell Square Compatible Hardware Bundles for all these printers that includes s Refurbished Receipt Printer and a New compatible cash drawer plus cables, paper and everything you need to get started!
POS-5805DD bluetooth thermal printer is compatible for iOS Android Windows devices. You can connect it to your smartphone via bluetooth. It can print fast & clearly. Support bluetooth connection for i…
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. 
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”.
Square for Restaurants just launched! Whether you have a full service or a grab and go, Square for Restaurants is built for your front of house, back of house and office. Learn all about how to set up, run, and troubleshoot here.
( 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…