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.
The Star Micronics TSP143IIILAN works with Square Payments. Star Micronics is a well known manufacturer of receipt printers. They make many different models. You connect to a Square iPad stand with a USB cable. This receipt printer uses 80 mm width or 3 1/8 inch width thermal paper for the receipts. There is a roll of paper that ships with the receipt printer. An auto cutter mechanism cuts the receipt paper for you when you make a sale.
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.
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.
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I’d like to take a step back from discussing integration challenges to mention a few examples from the Square Register code base that made my life easier for this project. The code separates operations looking for connected peripherals and interacting with them and uses abstract superclasses to provide a consistent API to the rest of the app. Because the code was so robust, my new printer code fit well into the rest of the app, and existing code used by other printers fit well into my own new code. One good example is our receipt image renderer. The renderer works by putting data into an HTML document styled by CSS, rendering that HTML into an unseen web view and then rendering the view into PNG image data that can be sent to the printer. The HTML and CSS scale to fit different-sized windows and thus are a good generalizable solution for multiple print widths. All of the printers that we had previously supported (WiFi and USB printers) printed three-inch wide receipts. However most of the Bluetooth printers I worked with use two-inch wide paper. Thanks to the flexibility of our renderer, all I had to do was set the correct print width of a printer and voilà — the receipts were seamlessly resized and looked great.
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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.
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 …
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.
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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:
Square introduces more ways to engage with customers. Square now integrates with cash drawers and receipt printers. With a single tap on an iPad, you can open your register’s drawer to complete a cash sale or make change. Please read the options below carefully before purchasing a cash drawer.
* All credit sale plans are issued by Square, Inc. Plans are not available to merchants located in AL, DE, MS, MO, NH, and TN. The individual authorized to act on behalf of the business must be a U.S. citizen or permanent resident and at least 18 years old. Valid U.S. bank account and Social Security number or Individual Taxpayer Identification Number are required. Plans may be selected from 3-, 6-, 12-, or 24-month terms and are based on the financing amount requested. The finance charge amount and installment payment amounts will depend on the repayment term selected. Sales tax, where applicable, cannot be financed and will be due upon acceptance of contract. The final payment will be equal to or less than the regular monthly payment. All plans are subject to approval based on credit and other factors.
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.
Implementing Bluetooth printing introduced new limitations in parallel processing and communication that required me to rethink how we manage concurrency in our printing system. If you’re familiar with multi-threaded code, you probably already realize that expensive operations, such as peripheral communication, downloading and uploading, and heavy computation, are best run asynchronously off the main UI thread. In our code for WiFi printing, this is done using the most basic functionality of Grand Central Dispatch (GCD), one of Apple’s built-in mechanisms for managing concurrent tasks. For more detailed info about GCD, read Apple’s documentation . Each print operation and printer discovery operation is added to a global concurrent queue that runs the code on a private thread, abstracting away the mechanics of threading. The result of this is that the different operations are allowed to run in parallel with no restraints and no control.
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.
I spent years in jobs that included lots of cash handling. This cash drawer is the nicest I’ve seen. It’s solid build will last for years and its finish is just lovely. It triggers cleanly and the drawer all but shoots out when triggered. I’m very pleased.
Connect supported receipt printers, cash drawers, and bar code scanners to the Square app on the iPad. If you have any connectivity issues after following the steps below, learn how to troubleshoot your hardware.
Square Point of Sale (formerly Register) is the free point-of-sale app that gives you everything you need to run and grow your business. Accept debit and credit cards with a Square Reader for magstripe, and accept EMV chip cards and Apple Pay with the Square Reader for contactless and chip. Funds are deposited fast—see money in your bank account in one to two business days. Use your point of sale system to keep track of sales and inventory in real time, manage items and employees, and view analytics about your business. All this with no long-term contracts or surprise fees.
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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Please help! I ordered a pos hardware bundle from Walmart.com and it’s not recognized by My square stand! Is there a way of “tricking” square stand into recognizing my usb receipt printer and cash drawer?
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.
Had 3 of these in my place to on cash draws one in the kitchen they work well as long as there is no internet/WiFi drop off. Using it with couple IPad Airs and Square register app for several years. When I loose internet or sometimes they seem to disconnect from the register even when I don’t have internet problems and they usually have to powered off and on. Also in the mean time my cash draw wont open and I have to find the key. Being so annoyed I with connection issues I have since replaced them with the USB versions (except the kitchen one) and all my problems stopped.
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! 😀
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.
More information.

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
Plan term and select coverage begins date of purchase and is inclusive of the manufacturer’s warranty. All other coverage begins after the manufacturer’s warranty expires. Plan is fully refunded if canceled within 30 days.
It supports 58mm width thermal paper printing, with high printing speed, clear printing & low noise. You can connect your devices with the printer via BT 4.0 & 3.0, USB cable or serial port line. Prin…
First and foremost, a little background info: I own my own business and have been using the Square Register POS system for over four years. I have a different kit, but they’re all similar products. When my friends decided to open their restaurant, they went with an old school cash register and struggled at the end of the night with keeping track of taxes because it was not as intuitive to use. I convinced them to order this kit from Amazon and the other necessary items elsewhere and helped them set everything up in less than 30 minutes. This kit provided an excellent, trusted printer and an easy to connect cash drawer. Upon arrival, I had an issue with the cash drawer – it would not open. A quick email (on a Sunday) to the seller, and he gave me advice and a link to an explanation as to how to fix the stuck drawer. Using his explanation took me a couple of minutes to fix it. I am a realistic person, and I understand that things don’t always go as planned, so I was happy the seller worked with me fast to come to a solution. I gave this five stars because of the customer service – you can find similar products elsewhere and they all work the same way… but the customer service provided made this an excellent purchase! Thanks EOM-POS!
*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)
@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! 
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.
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.
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.
Bought this strictly to print receipts with the Amazon Local Register iPad App and card reader, as it is the only receipt printer supported at this time by that platform. (Bought it used via an Amazon re-seller; works perfectly. It was easy to set up on the network using the downloadable Windows software. Once set up, my iPad and the Amazon Local Register app found the printer and linked to it easily. I haven’t tried using any of the other options (like printing our logo or printing coupons), but for what I bought it for it works perfectly. It prints extremely fast and clearly. The cutter works well, too. It is nice that it can be mounted to a vertical surface if desired.
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.
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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. 
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.

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