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
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The printer that Square supports is one of the largest used brands in the receipt printer market.  They are not getting kickbacks on printers as the printers are sold by hundreds of places including Amazon, and the buyer doesn’t know you are buying it to print with Square as the printer is also used by 100s of other POS systems. More printer options would always be better, but as this is one of the industry standard printers it only makes sense they support it.
A perfect match for Square Credit Card Processing. The printer arrived as described. Easy setup and user friendly. Printer has a metal case is very heavy duty. One can add a logo to the customer receipts. Arrived as described and within the stated delivery time.
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.
For this particular setup, you’ll need to create a printer station. Printer stations let you designate specific tasks for your printers, like printing receipts, tickets, or stubs. With your printer plugged in, go to Settings, Printers, and Create Printer Station. Enter a printer station name. Now select what you’d like your printer to print. Make sure you select at least one option. Then tap the printer selection menu and select your printer. Test your printer by tapping Test Print. Then, tap Save. Your printer station settings are now saved and can be applied to any connected printer.
300mm /second ultra high-speed printing, greatly improve the printing efficiency. – This thermal printer is designed for network and kitchen printing. 58mm and 80mm adjustable printing paper width, 30…
Bixolon Srp-350iii Direct Thermal Printer – Monochrome – Desktop – Receipt Print – 2.83″ Print Width – 9.84 In/s Mono – 180 Dpi – 64 Mb – Usb – Serial – Thermal Paper, Receipt – 3.27″ (srp-350iiicosg)
A quick look at using the TSP100 ECO thermal receipt printer with a Square Stand. The TSP100ECO is an eco-friendly thermal receipt printer that cuts down on using power by only turning on when connected via USB to a powered device.
This is an impact printer. So it makes a noise when it prints. Why would you want this? You might want it if you are in an area such as a kitchen where thermal paper receipts don’t print as well because of moisture in the area. You would not want this noise around customers. But if you have a moist area such as a busy kitchen this impact printer may be what you can use. Here is the user manual for the Star Micronics SP742ML.
Unless proven otherwise, I agree.  And in my business, giving a client a receipt on what amounts to a piece of adding machine paper is unprofessional.  I should be able to use any printer that is compatible with the iPad, not just the uni-tasker receipt printers.
Printer Type: High Performance POS Dot Matrix. You have the flexibility of using paper widths of 58, 70 or 76mm rolls to suit your needs with this dot matrix printer. (Serial Interface ). Interface: S…
Interface: USB. What happens if the printer does not work with my computer?. New USB Cable (Free). Max Resolution ( B&W ): 20 x 15 cpi. Great Working Condition. we will be glad to work with you to hav…
Acts as a regular printer, you install it, and print whatever you want to it and it automatically scales it down to the margin on the printer paper and done deal(No need to go around playing with settings) NOTE: CHROME STILL LIKES TO USE 2 MILES OF THE PAPER SO I DONT KNOW ABOUT CHROME AS MY POS FRONT END. I USE FIREFOX OR OPERA)
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.
SM-T300i Mobile Printer (SM-T300I2-DB50 US GRY), 3-Inch Print Width, Bluetooth 2.0, Serial Interface, (Includes Serial Cable, Battery Pack, AC Charger, Sample Paper Roll), Color: Gray (Part Number: 39634010)
Here are more informative websites.

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.
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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”.
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.
POS printers and accessories allow you to enhance the functionality of your existing point-of-sale hardware. These devices add the ability to display pricing to your customers or create a printed receipt for each transaction. This promotes solid customer service experiences.