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. 
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.
Just click the Transaction and the Receipt will preview on the right-hand side. At the bottom, you’ll see the receipt number (ex: Receipt #H8R5). Click that and it will show you the digital version of the receipt. From there you’re good to print on the standard 8×11 printer paper.
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.
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). 
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POSGuys.com is here to help you find the right printer for your specific business needs. Call 800.903.6571 for assistance or email sales@POSGuys.com. If you’ve already purchased one of the Square Compatible printers from us and need help with your setup, email support@POSGuys.com.
If you have a Square Stand, in addition to the printers above, you can use certain USB interface receipt printers. The following receipt printers are only compatible with the Square Stand, not the Square card reader:
These receipt printers are certified to be comaptible with Square Reader and Square Reader software for iPad, iPhone and Andoid.  Contact us if you have any questions about which printers, cash drawers or other components will work with your Square Reader application.  Get your business or store online today!
I already had the square reader and just was tired of it being in other spots or being charged. The dock was a great addition to the square stand and the printer. Very easy to use. Just attach to the square stand and put the reader in. The dock has weight to it so i dont have to worry about it falling especially in the spot i put it. Definitely reccomend
STAR MICRONICS 39336532 SP742ME Receipt/Kitchen Printer, Impact Dot Matrix, 4.7 lps print speed, ETHERNET Interface, with AUTO-CUTTER and Internal Universal Power supply. Order Printer Cable Separately. Color: GRAY (replaces 39336531), 39336532 $367.23 $274.06
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.
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
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.
POS-X CD16 Electronic Cash Drawer, 15.9″(W) x 16.7″(L) w/ CANADIAN 8coin/4bill cash tray insert and DUAL MEDIA SLOTS, Painted Face – Includes STAR Receipt Printer Interface Cable and 2 Keys. COLOR: BLACK, CC-410-B2-C $119.51 $89.19
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.
Kitchen printers are typically impact printers. They use a ribbon in the printing process. Impact printers are not affected by heat and are therefore best suited for use in places like kitchens. Impact printers, (called dot matrix printers), use an ink ribbon to print on regular paper. The Star Micronics SP742 is an ideal printing solution for the kitchen. This fast, two-color printer offers crisp, easy to read type for quick viewing, a clamshell design for easy paper loading and an embedded power supply for space efficiency.
With your choice of one or two under till media slots, the Series 4000 makes safely storing receipts, large bills, or other important media a snap. The spacious heavy duty till features coated bill stays and stronger than average dividers, so you can be sure your money stays put.
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.
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
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.
58mm POS Printer 384 line Thermal Dot Receipt 12v USB Printer Set w/ Roll Paper Package Content: 1 x Thermal Printer 1 x Instruction Manual 1 x Printer Driver 1 x USB Cable 1 x Power Cord 1 x 58mm The…
@usascottwright – While we don’t currently support Epson printers, it’s definitely a popular feature request. I’ll update this thread if that changes in the future! Also, apologies for the delay in following up with you. 
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. 
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…
Electronic Cash Drawer It has 5 bill trays, 5 coin trays and a bill entry, keeping your money organized and largely improve your working efficiency and accuracy. 1 Cash Drawer. Only the cash drawer is…
Note that you may connect a barcode scanner via USB cable to the Square Stand, but if you are using an iPad without Square Stand, the barcode scanner must be a bluetooth barcode scanner. For more information on the correct bluetooth scanner to use when connecting directly to an iPad, click here.

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