Quantity   Component name
1 × Arduino (micro, uno, etc)
1 × RTC Clock module I used this one from adafruit: https://www.adafruit.com/products/264
1 × momentary contact switch a simple push button
1 × Thermal Receipt Printer Guts found on Adafruit again: https://www.adafruit.com/products/2753
1 × Breadboard Electronic Components / Misc. Electronic Components
1 × Power Supply Must be at least 2.5A at 5v
12 × Hookup wires A dozen or so should do the trick