I am starting from scratch. I had zero experience compiling Marlin. Took me half the day. Figured I would share the steps so you, too, could start to play with the features in Marlin that Robo is not using yet. Hope this post will help others too timid to try. It is really not all that crazy, but seems overwhelming at first. Here is what I did. Before I tackled compiling Waldo's version of the Marlin f/w, I started with Robo's, just to convince myself I could. Then I moved on to the excellent work @WheresWaldo did, with the hopes of using UBL and eventually the g-code controlled lighting mod. I already have the light mod that @Kilrah came up with, and love it. Thank you both for all of your contributions to these forums. Along with others, you have helped me numerous times. Without further delay, the steps: installed GitHub desktop from here: https://desktop.github.com/ installed Arduino IDE from here: https://www.arduino.cc/en/Main/Software in the GitHub IDE, I downloaded the Robo f/w from https://github.com/Robo3D/Marlin in the Arduino IDE, I opened this file: Marlin.ino in the Arduino IDE, I tried to compile, and quickly got an error: Pins for this chip not defined in Arduino.h! in the Arduino IDE, I set the board type to Arduino / Genuino Mega or Mega 2560. I got this info from reading through @WheresWaldo comments in his code. It wasn't obvious to me, so that is why I am emphasizing it here. Tried to compile again, success in compiling. in the Arduino IDE, I chose sketch, export compiled binary. That made the hex files (for R2 and C2). now the fun began. I downloaded @WheresWaldo version from here: https://github.com/WheresWaldo/Marlin_for_R2/tree/1.1.8 in the Arduino IDE, I opened the Marlin.ino file inside the folder from @WheresWaldo compiled it and exported the hex file. Now once the parts come in from China, I will be able to make the light mods as specified in this excellent mod: http://community.robo3d.com/index.php?threads/g-code-controlled-case-lighting.19871/ In the meantime, I will load the hex file from #10 above and try to get UBL working with my R2, as outlined by @WheresWaldo in this thread: http://community.robo3d.com/index.php?threads/marlin-for-the-r2-ubl-enabled.19405/ Thanks again, and I hope this thread will help owners of the R2 play more with the capabilities of Marlin on their R2.