Receipt printers are a fantastic way of adding an inexpensive, simple-to-use, small printer to any project using only two serial communication lines.
Thermal Printer with Arduino Nano
Thermal Printer Interfacing with Arduino Uno
Embedded Thermal Printer - DFRobot
How to connect Arduino Nano to Thermal Printer via serial connection - Arduino Stack Exchange
Arduino Printer Tutorial
Adam meyer Arduino + Thermal_Printer
Control a thermal printer with Arduino
Thermal Printer and Pushbutton: Compatible? - Project Guidance - Arduino Forum
ESC/POS Thermal Printer and Mono (or .Net) – electronic fields
Thermal printer: problems when printing 180 degrees - Project Guidance - Arduino Forum
Your Twitter Feed as Newspaper: A Look at the Tiny-Printer Trend