If the email address entered for receipt delivery is no longer active or is incorrect, Square will need to unlink this information from your customer’s payment card.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. 
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. 
I do appreciate your post though and I wanted to let you know that we are working to provide support for more printers and your feedback is welcome! For example, we recently launched support for several Epson printers which can be used with Square on iOS devices (the full list of printers is here). 
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.
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. 
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.

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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”.
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. 
You can use any of our Square Compatible Receipt Printers with the Square Stand Hardware, this setup has the most options to choose from. It just depends how you want to connect to the Square Stand and how many stations you have. If you are connecting straight to the Square Stand via the USB hub, or with Bluetooth we offer the following Thermal Printers for printing Credit Card Receipts :
*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)
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. 
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 1 Cash Drawer. Only the cash drawer is…
A simple print button on the tablet application would allow us to connect to a local or network printer and print the same form data. Why is this still impossible? Why can we still not utilize our desktop or local printers to print receipt data from the app? 
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
The STAR MICRONICS SM-T300I is also a light weight receipt printer. But it’s very durable and rugged. It’s also Apple MFi certified for iOS phone and iPads. It also works with Android and Windows. It’s been tested to take a little bit of beating and is used by people who are outside a lot. Having said that the price is higher than other printers. If you need something rugged, this device may be the one for you. But if you don’t. You will want to look at something else as this device can get expensive. The SM-T300i is easy to use. There is a well written and very detailed user manual. The user manual gives details on how to configure the receipt printer and how to load paper. Here is a link to the Star Micronics SM-T300i User Manual.
Cash Drawer   Features: This cash drawer box is made from robust steel. Comes with RJ11 cable, plug for connection to receipt printers. Standard-duty, fast and reliable cash drawer. The 3-position …
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
The TSP143UII ECO thermal receipt printer is directly supported in Square Stand and is both fast and reliable. This receipt printer can print as many as 30 six inch receipts per minute. The Mean Cycles Before Failure (MCBF) is 60 million lines and the Guillotine Auto cutter of 1 Million cuts. It has a clamshell design that allows for very fast and easy paper loading. There is no need to download drivers or utilities – they’re all included in the box. The futurePRNT Receipt Redisign Software allows you to customize and brand receipts – to help you keep customers coming back time and time again with professional graphics (logos, coupons, and merge images), word-triggered advertising, and more! It is also included on installation CD and is free and simple to use. In fact, the TSP143UII ECO thermal receipt printer comes complete with everything you need including: printer, power supply, USB cable, wall bracket – even a sample (partial) roll of thermal paper to get you started.
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.
Paper Width: 58mm( -0.1mm). 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. Blueto…
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 accept credit card payments from your customers at your place of business, you’ll want a receipt printer. A receipt printer automatically prints a receipt for your customer when they make a purchase.
It has 5 bill trays, 5 coin trays and a bill entry, keeping your money organized and largely improve your working efficiency and accuracy. There are 5 bill trays and 5 coin trays, with a bill entry, y…
NOT FOR USE WITH SQUARE STAND! If using a Square Stand consider the Square Stand Starter kit which has a printer that plugs into the stand. The printer in this kit must be plugged into your router.    
EASY INTEGRATION – Star Micronics Printer and Cash Drawer Easily integrate with Square POS system. STAR MICRONICS RECEIPT PRINTER – Integrates easily with Square POS. Comparable to APG 16 x 16 Vasario…
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.
If my answer solved your problem, would you mind marking it as “Best Answer”? That’ll help the rest of the community find what they’re looking for. If not, just write back, and I’ll continue to help. Thanks!