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.
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.
Square Register on an iPad works with a broad range of third-party hardware devices. Listed below, you’ll discover a list of supported devices, where to acquire them and info on reading up.Note: Square isn’t suitable with Quebec Sales Recording Modules (SRMs/MEVs) needed for dining establishments. Receipt Printer Compatible With Square.
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 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.
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.
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.
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.
@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! 
Print 58mm wide thermal paper, with 100km reliability TPH life. Paper Width: 58mm( -0.1mm). POS-5805DD mini thermal printer is compatible for iOS Android Windows devices, supporting BT(wireless), USB …
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.
This is one of the more common receipt printers used with Square Payments. It generally costs less than $200. It come in white and black color. It has an auto-cutter to slice receipt paper for you. It uses thermal paper so you never never need to fill it with ink. It is generally easy to maintain and add paper when you need it. So this is a printer that works well in a wide variety of environments. However, if you are in a kitchen or some area where the air is moist you may want to get an impact printer as thermal paper does not work well in moist environments where there is little ventilation. ​Here is the user manual for the Star Micronics SM-S230i.
The Star Micronics SM-S230i is light weight at only 7.7 ounces. It is small and easy to carry around. If you’re someone who sell at a farmers market, craft fair or some other place where mobility is very important, the Star Micronics SM-S230i may be what you need. It uses thermal paper and connects to your iPhone, iPad with bluetooth or USB. ​Here is the user manual for the Star Micronics SM-S230i.
If you are buying this for the Amazon Local Register payment platform, be sure to get the Ethernet version (not the USB version). This one only connects to your network and not directly to a computer.
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Impact printers only print order tickets for a kitchen. They’re not affected by heat and can withstand warm environments. They require heat-sensitive paper and won’t work with non-thermal, receipt printer paper. 
The printer is great and works as described, but the product description is misleading. It says that it is a bluetooth printer AND cash drawer, which would imply they both are bluetooth. In the extra bullet points it further states its not a usb cash drawer (which would lead one to believe it was bluetooth because nothing else works with Square). What they send is a cash drawer that connects via a phone jack cable. This is not stated anywhere in the description. I needed a bluetooth cash drawer to go with the bluetooth printer and my wireless computer system. It also advertises that it is for a SQUARE POS system. Well, that uses USB or bluetooth. NOT A STUPID PHONE JACK CABLE!! I looked all over for what I thought this was and find it isn’t! Very disappointed. Now what do I do with a useless cash drawer? Oversize paperweight?
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.
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/
I do not nor do I need a receipt printer. All I want is a USB cash drawer that costs less than $235. Square, if you’re reading this, please add support for a wider variety of USB cash drawers. Your focus is small businesses. Not sure why you have only the most expensive cash drawer (more than 2x the Price of the Square Stand) as the only USB one supported). Surely it can’t be that hard to come up with new drivers?
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Atm it’s cheaper for me to use something else other than square, than to change the printer tablet setup. It appears other people have similar issues. Square managment need to grasp the economics here of only catering to a small hardware segment(Star printers) of the market, while marketing themselves as a simple DIY eftpos POS for small businesses, who burn themselves on compatability issues. Hopefully Square can solve this issue.
Features: 100% Brand new and high quality! Compared to conventional thermal receipt printer, the printer has a smaller mini body, more reliable capability, more stable printing and portable advantages…
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.
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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. 
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.
Ethernet invoice printers can be utilized to print consumer bills, order tickets and order ticket stubs. Ethernet-interface printers are best for fixed usage and aren’t developed to be mobile.The Ethernet printers suitable with Square Register are thermal printers. They need heat-sensitive paper and will not deal with non-thermal invoice paper. These kinds of printers aren’t perfect for kitchen areas or high-temperature workspace.
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.
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.
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.
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.
Square Register Bluetooth Printer, Star Micronics SM-T300i Mobile Printer, 3 Inch Rugged Portable Printer, MFI Certified, iOS, Android, Windows, Tear-Bar, Bluetooth 2.0/Serial, No MSR, Grey Color Case, Includes Belt Clip, Serial Cable, Lithium Ion Battery Pack, AC Adapter/Charger, Sample Roll Paper, LCD Display, Set-Up Sheet, SM-T300i-DB50 – 39631810
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.
SQUARE and SHOPIFY POS BUNDLE INCLUDES: • Square and Shopify recommended Star Micronics TSP654IIBI-24 Wireless/Bluetooth receipt printer. • Shopify/Square recommended printer driven 16X16 Cash Drawer. Comparable to APG 16×16 Vasario Series Cash Drawer Part #: VB320-BL1616 The compact footprint fits easily on your countertop and saves precious counter space. The clamshell design allows for fast and easy paper and ribbon loading. This printer can print 60 receipts per minute via Bluetooth connection, so you can tackle your daily needs with ease and efficiency. Pair it to your Shopify POS without a Wi-Fi connection. Need more counter space? Mount the printer to the wall with the included wall mount bracket. • Avoid complicated network setups – simply sync via Bluetooth, and you’re ready to print receipts from your iPad. • Uses thermal printing technology, so you’ll never need expensive ink or toner. • The Retail Package upgrade is required for this to connect to Shopify POS. Recommended for merchants who are looking for an easy to set up, reliable receipt printer.
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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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.
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.
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
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.