Direct Thermal PrinterThe Zebra LP 2844 GK420d GC420d ZD420 ZD421d Direct Thermal Printer is the required printer to use with our thermal labels. The current Zebra model we support is the ZD421d, but all of these models will work with our labels. Dont let the small size fool you. This is a powerful printer easy to use and inexpensive to maintain. The best part is that with our Direct Thermal Labels, the ink is embedded in the label, which means you never need to buy toner