Geeetech A10M Marlin 1.1.9 Firmware

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This is Marlin 1.1.9 Firmware for Geeetech A10M printers with mixing extruder. I ported all Geeetech features from Geeetech's 1.1.8 version, which include: - Full BLTouch support with my hack allowing to fine tune small build plate tilts which could not be eliminated by autolevel alone; BLTouch is enabled by default, disable it by commenting "#define BLTOUCH" line in the Configuration.h file if needed. - Power loss recovery/resume. I tried to activate a native Marlin power loss feature but it won't compile due to global variable's memory exhaustion. Finally I decided to port a limited Geeetech's version of this feature which appeared working pretty good. - Gradient mix/Filament mixer features. Current Marlin version has just a rudimentary support for mixing extruders, there still a lot of bugs and sub-optimal code implementations in this extent. I made some changes in the original Marlin code to make a mixing extruder work fine. As such I made a number of bug fixes for Filament Change feature, including the implementation of M701/M702 g-codes. - Fine-tuned extrusion parameters, as such I calibrated the extruders increasing Steps per mm value from 340 to 430. - Runout sensors enabled; - Other tweaks and tune ups. A couple of words about tilting compensation hack. My experience of working with different machines using auto-level feature under Marlin firmware shows that all hardware has a consistent auto-level error causing a tilt of the build plate to one of the corners which can reach tenths of mm in some cases. Every hardware I used had this tilt error of unclear nature which may differ in a particular corner to tilt to, but it doesn't depend on a sensor type (I used inductive, capacitive and, of course, BLTouch - all of them had that tilt error). So after a lot of unsuccessful attempts to tweak this using Marlin features alone, I made my own hack in the Marlin code to resolve this issue. I added a few lines to the Configuration.h file to control this feature: #define TILT_COMPENSATION #if ENABLED(TILT_COMPENSATION) #define X_TILT_COMP 0.04 // lower value - left bed edge higher #define Y_TILT_COMP 0.3 // lower value - front bed edge higher #endif These are values that work for my machine, which may or may not fit your one. In the case you see a distinctive tilt into one or both sides of the build plate, first try to disable this feature and perform a test print. Tweak X_TILT_COMP and Y_TILT_COMP if needed to achieve an absolutely flat first layer printout. Use "leveling_test.stl" model to test auto-level accuracy. I made some work tests of this firmware but there still could be bugs there, so use it on your own risk. Enjoy! Update 1: My Start and End G-codes in Cura working well with this firmware: ;Start G-Code: M104 S0 ;extruder heater off M140 S0 ;heated bed heater off (if you have it) G91 ;relative positioning G1 E-1 F300 ;retract the filament a bit before lifting the nozzle, to release some of the pressure G1 Z+0.5 E-5 X-20 Y-20 F9000 ;move Z up a bit and retract filament even more M84 ;steppers off G90 ;absolute positioning ;----------------------------------------------------------- ;End G-Code: M104 S0 ;extruder heater off M140 S0 ;heated bed heater off (if you have it) G91 ;relative positioning G1 E-1 F300 ;retract the filament a bit before lifting the nozzle, to release some of the pressure G1 Z+0.5 E-5 X-20 Y-20 F9000 ;move Z up a bit and retract filament even more M84 ;steppers off G90 ;absolute positioning ;----------------------------------------------------------- Update 2: Important Found a bug in the e-factor for the extruders feed rate, causing the second extruder to perform incorrectly in some circumstances (thanks to the user szerwi). Firmware file updated, please download the latest version and re-flash.