Hi all! I have had my Robo for a few weeks, but I have multiple job titles so I haven't got to use it much. I finally decided to calibrate the Extruder yesterday, because I was having issues with the first layer and I noticed it was under-extruding on the top layer as well. Definitely, should have been one of the first things I did. I followed the steps in the YouTube video created by Tom at Tom's Hardware. So I marked the Filament at 150mm and then extruded 100mm, my first result was 86mm of filament extruded. Initially my steps per unit was 723.38, so I took (723.38 x 100)/86 = 841.14. I was able to override the initial steps per unit by using M92 E841.14. I then retested a few times and it was close, +/- a few mm, which I am happy with for now. As soon as I can permanently change this, I will go back and re-calibrate. Initially, I thought I could modify this by increasing/decreasing the extrusion multiplier, but that does not seem to do anything? I would really prefer not to have to enter this override every time I open Simplify3D. So, I thought I would follow another one of Tom's videos and edit the firmware. But when I tried to get the firmware from Robo3D, it states in bold to not update the firmware for the Robo R1 +PLUS? I have also never worked with Arduino before so this C++ is pretty new to me, besides some coding experience and G/M code (CNC Mill though). I believe I found the correct firmware, Marlin-1.0.2-1? I read in these forums it could be ROBO3D_LEADSCREW_V1 as well? I also went and grabbed the latest version of u8glib_arduino_v1.18.1. But now I am kind of at a loss because I do not really want to update the firmware and possibly void my warranty? On a side note, if I screw/bolt anything through the Robo3D case does that void the warranty? Would I be better off just moving to the newest version of Marlin 1.1.0 RC3? Since I am not supposed to update the firmware, can I put this code in the Starting Script? I would prefer to update the firmware with the changes instead, as I am getting my Full Graphics LCD later this week and will probably have to update the firmware to get that installed as well. I did read something about the new firmware already accepting the Full Graphics LCD though? I also just want to learn more about how the 3D printer operates, and the firmware will be key if I can browse it. I tried contacting Robo 3D directly about this but the Tech Support guy was very unhelpful, basically just kept saying all he can do is escalate this issue. I thought about contacting Simplify3D but I feel this is a question for Robo 3D. Any help with this will be greatly appreciated. Thanks!