Bootloaders and EEPROM - Understanding your 3D printer for beginners
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 Published On Jul 28, 2020

Many have misunderstood the humble bootloader and EEPROM. This video aims to change that, going through each in detail, explaining how they work and how they may affect the end user. Hopefully this video allows beginners to improve their knowledge so they can better troubleshoot potential issues.

Take home points:
A bootloader is a simple piece of software that makes updating firmware easy. It runs when the printer first turns on in case a firmware file is available. It only needs to be burned once and will then be in place for any future updates.

The EEPROM is a way of storing 3D printer settings even after the printer is turned off. Values from the EEPROM are loaded over those hard coded in the firmware, so using M503 to see exactly what the printer is doing is highly recommended, as is issuing an M502 followed by M500 if something seems off.

Arduino bootloader reference: https://www.arduino.cc/en/Hacking/Bootloader
Arduino EEPROM reference: https://www.arduino.cc/en/Reference/EEPROM
EEPROM wikipedia page: https://en.wikipedia.org/wiki/EEPROM
Marlin EEPROM reference:
M500: https://marlinfw.org/docs/gcode/M500.html
M501: https://marlinfw.org/docs/gcode/M501.html
M502: https://marlinfw.org/docs/gcode/M502.html
M503: https://marlinfw.org/docs/gcode/M503.html

Pronterface software: https://www.pronterface.com

3D printing for beginners playlist: https://www.youtube.com/playlist?list=PLGqRUdq5ULsOwW9G08jV43YTdMyqJ6xGB
Ender 3 bootloader video: https://youtu.be/aQIg9zxuCvM
Ender 5 bootloader video: https://youtu.be/fIl5X2ffdyo

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