#4 adafruit thermal printer. Print & Inside Circuit. Can be used for low cost cloud printer solution 

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It's an adafruit Thermal printer. I have connected it with esp32 and print using sample code.
Code & details can be found from here. learn.adafruit...
for esp32 integration just use eps32 software serial library. Adafruit thermal printer library & esp32 software serial library can be found in arduino library manager. I have used pin 18 & 19 of ESP32.
#define TX_PIN 18 // Arduino transmit YELLOW WIRE labeled RX on printer
#define RX_PIN 19 // Arduino receive GREEN WIRE labeled TX on printer
Power Supply: This printer is power hungry. Please use a separate power supply to feed the power I have used here 8V to operate the printer.
Inside circuit of the Printer:
Microcontroller : LPC1110 , 32 bit ARM Cortex-M0 microcontroller
Motor Driver : A3906, Low Voltage Stepper and Single/Dual Motor Driver
Flash Memory: winbond W2516DV, Serial Flash Memory with Dual and Quad SPI
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