Here are the files for Marlin 1.1.0 RCBugFix as of January 1, 2017. I have separated them out into several compressed archive files. Just download the one you need and extract the appropriate files within the Marlin source subdirectory. You cannot use configuration files from previous Marlin releases or from previous Release Candidates. These archives contain the complete source modified as noted. This version and future versions of Marlin must be compiled on Arduino IDE 1.6.8 or newer. Basic steps required: Download one of the attached files appropriate for your hardware RC8_ABL_R1_01-01 for Robo R1 with 8 mm Z Axis threaded rods RC8_ABL_PLUS_01-01 for Robo R1+PLUS and R1's upgraded with the Z-Axis lead screw upgrade kit from Robo3D RC8_ABL_TR8_01-01 for Robo R1's with upgraded Z Axis 3rd party lead screws Compile and upload to your Arduino 2540 board using the Arduino IDE. Compilation has been tested with Arduino IDE version 1.6.13 and 1.8.0. After successful upload, clear EEPROM memory by issuing the following two commands in terminal mode: M502 M500 Re-enter you Z axis offset using M851 as a positive number. M565 support is not supported in this version Common to all these files are: Set up for Hexagon hotend Full Graphics LCD enabled EEPROM memory enabled Automatic Bed Leveling enabled w/16 probe points (4 x 4 grid) BILINEAR bed leveling enabled as default Major performance improvement for Graphical LCDs Some other stuff New - FADE control allows you to compensate for bed unevenness over a longer range of Z heights. By default, all corrections are made in layer one. To enable this you must issue a M420 Zn.nn code either in a terminal window or added to the beginning of your startup script. Value n.nn is the number of millimeters you would like the FADE to occur in. New - The LCD now features a more streamlined small font and a big font for single line items. If you LCD exhibits screen corruption as a result of the sped up code, change line # 500 in Configuration_adv.h to a value of 10. This function will work on most LCD screens with a value as low as 5 uS which can speed up the screen writes significantly. The full speedup (using 5 uS screen delay) can save as much as 300,000 CPU cycles. New - With the proper wiring you can now control RGB LEDs direct from your printer using the M150 code. Requires that #define RGB_LED be enabled (Configuration.h line # 1388) and the LED is attached to pins 34, 43, 35 by default. (This feature is currently disabled) Please note that I am not one of the Marlin developers. If you have an issue with this release post here first. If it is determined that it is not a configuration issue, then you may be directed to post the issue on Marlin's GITHUB. I cannot guarantee success using beta firmware, I can vouch for error free compiling with these included files. If there are issues with the configuration let me know and we can work on them together. Original post (#1) edited to provide a link to RC8 and current RCBugFix files.