Replace the default config.h file in GRBL with the one supplied in the 'Thing Files' section #Drawing software for grbl plotter codeOther GRBL versions do not have the control code for the Z axis servo. Place this version of GRBL Firmware for the Arduino on your computer. My drawing robot is modified version of this one I have posted all needed files so that there isn't confusion regarding which parts are needed from each of the original designs. I also clarified the names that were in Spanish. There is an even better pen holder in the remix section. I added a stronger pen slider and a controller enclosure. There are only 15 parts to print and none of them are very large. I have posted all the parts needed from the two source designs. #Drawing software for grbl plotter driversIf you have problems with your stepper motors moving and you believe everything else above is OK, check that the small current adjustment on your stepper drivers are set mid point and also set the drive current to 1 amp using the correct procedure for your driver.Be sure to set the correct MI Extension parameters the first time you get the MI extension pop up.You must do this or the robot will not work. This step is missing from the otherwise excellent instructions. Set the GRBL parameters to the settings that are provided in one of the photos.Don't send me a message about this because it means you failed to perform this step IF YOU FAIL TO PERFORM THIS STEP, the robot will draw at a 45 degree angle. Replace the 'config.h' file with the one provided which has the correct features enabled before you compile and download from the Arduino IDE.
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