Hopefully someone can help as I'm pulling hair out with this particular one. I have a standard BigBox Kickstarter 1.0 Dual with no mods. Firmware being used is the latest from Alex https://github.com/Alex9779/Marlin/tree/BigBox/Dual/RC Compiled using Arduino 1.6.9 with no issues and uploaded through Octoprint 1.2.12 using the Firmware updater. Set home and carried out the 9 point bed levelling, all looking good. Chose the traffic cones as a dual slice in S3D 3.1.0 using again Alex's .FFF for dual big box. Uploaded to BigBox and hit print, all starts fine, heads and bed warming up but for some reason during the 2nd extruder warming up the carriage decides to move. I've proved this to myself by typing in the G-Code line by line. I don't think there is anything wrong with the gcode as it runs with an old .HEX I have so I suspect the latest firmware. Any pointers greatly appreciated as I can't think what to try. Up to this point the BB has been working fine with no issues making it appear to be the firmware but I can't be the only one.