ESP8266 Remote Serial Port Wi-Fi Transciever Wireless Module. This module enables you to communicate with your 3D printer over Wi-Fi. I wanted to have the software ready to control your printer from a web site but I did not have the time to do that yet. So I thought by placing it on the site somebody might be up the challenge and write a blog on my site to tell the story.
This module is a 3.3V module and would need a voltage divider or the ESP-01 module to enable it to talk to the Arduino successfully with 5V logic levels.
To use this module you have to flash the esp8266 cpu with some firmware. Look at this article to help you flash the cpu from the arduino IDE - http://www.whatimade.today/esp8266-easiest-way-to-program-so-far/