I didn't use ESP8266, but bought WEMOS D1 mini Pro for several reasons: - it has much more RAM (1MB vs 16MB), so there is a lot of space for eventual upgrades in future - it supports 5v, so no need for AMS1117 voltage regulator - it has it's own USB port, so no need for extra Arduino board for flashing - it allows you to use external WiFi antenna for better coverage - ...and last, but not least, it cost me $6.05 USD with pins, external antenna, pigtail and free shipping:
And this is what you get when you power up your printer:
web UI screenshot:
The WiFi can be configured as an Access Point or Client that automatically connects to your existing WiFi router. Through the web UI, you have complete control over your printer. You can: - home one or all axis - move each axis - control extruder(s) - watch and control temperatures - send arbitrary G-Code - list files on SD card, upload new files to SD card, start a print
All can be done and set up in about 30mins... Highly recommended upgrade!!!