Quantity   Component name
1 × ESP-01
1 × Thermal Printer Preferably one that is compatible with adafruit's Thermal Printer Arduino Library
2 × Push buttons One for reset, one to enter programming mode and for triggering printing
4 × 10k resistor reset line pull-up. My ESP didn't work reliably without one
1 × LED Fiber Optics / Emitters
1 × Current limiting resistor for the LED
1 × Piece of breadboard
1 × 750 Ohm resistor