To create your own bar codes and labels, you’ll need to use a third-party application. At the moment, we don’t support bar code and label printers and can’t guarantee compatibility, but many customers have success using the DYMO Label Writer 450 and labels with Square.
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.
Barcode PrinteriPad Point of SaleBarcode ScanneriPad Barcode ScannersCash DraweriPad Cash DrawersCredit Card ReaderiPad Receipt PrintersGift Card PrintingiPad POS StandsMobile ComputeriPad POS KitsPOS SoftwareiPad POS Apps
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.
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.
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.
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.
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. 
First one we got was dead. Customer service is almost non-existent. Packaged it up and paid to ship back to repair center. Several weeks went by with no feedback, then received back the exact packaging with no note or anything to indicate what the issue was, or if it had even been fixed. It seems it has, but that process was a pain. Now it doesn’t like to stay visible on the network so we are always either re-booting or just telling people it’s broken. Turns out people don’t care all that much about paper receipts anyway. Recommend purchasing directly through Square if you really need it. At least then you might get some tech support.
Connect your Square Stand with a compatible iPad and recommended hardware accessories to help run your business. Before purchasing a Square Stand, make sure you’re using a supported iPad. You can identify your iPad model on Apple’s Support site.
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.
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.
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.
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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:
I looked around for a hardware bundle for my Square POS setup and ultimately went with this combination. Very pleased with the product and the seller’s follow up was excellent. They answered several of my questions quickly and over the holiday weekend.
I have my own iPad 2 and square stand. I was Looking for compatible hardware and this was excellent. The register and printer work great, I even ordered more papers for the printer so we will use it long term.
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.
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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
We really like the Apple MFi certification with the auto connect feature. We also like the small footprint of this receipt printer. Overall this is one easy and fast printer to setup. The Apple MFi makes it real easy. You just turn the printer on within range of your iPad.
MOTOROLA/SYMBOL LS2208-7AZU0100ZNA LS 2208, Includes Scanner and USB cable. NO HandsFree Intellistand Included With This Model. Compatible with Square Stand. Color: TWILIGHT BLACK, LS2208-7AZU0100ZNA $153.97 $114.90
Edit to say that the network issues I mentioned were tied to the wireless router we were using. Replaced that piece and the printer started working great. I still recommend purchasing as a package for better price and customer service, but not a bad piece of equipment.
APG CASH DRAWER VB554A-BL1616 Vasario Cash Drawer, USB INTERFACE, Painted Front with Dual Media Slots, 16.2”W x 16.3”D x 4.3”H, Adjustable Width Slots, 5 bill/5 coin till. COMPATIBLE WITH SQUARE STAND. Color: BLACK, VB554A-BL1616 $322.78 $240.88
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.
STAR MICRONICS 39472310 TSP143UIII ECO Thermal Receipt Printer KIT with AUTO-CUTTER and USB Interface. Compatible with Square Stand. Includes USB and Power Cables. Printer Drivers Included In The Box, Color: DARK GRAY (TSP143U-GRY), 39472310 $287.56 $214.60
With resistance to the most brutal environments, APG drawers feature sturdy steel frames powder coated in cloud white or black to resist scratches and other external abuse. Industrial grade steel ball bearing slides on the drawer won’t wear like silicon wheels and promote silky smooth opening and closing every time. The heavy duty latch mechanism is rated for over 4 million operations, allowing you to open the drawer 200 times a day, every day, for nearly 55 years.
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.