I made a core xy Arduino Grbl plotter , before assembling both x and y stepppers worked properly and once when I tried x axis command both y and x stepper started moving in opp direction when I pressed the y command both x and y start ed moving in same direction.. I checked each and every connection multiple times. Stilll it persists and later I replaced each parts separately a4988 drivers , Arduino, CNC shield v3 ..... but nothing worked I even tried uninstalling and installing Arduino IDE flashed Grbl again but still this problem is still there I don’t know what t do. If any can help me that would be a great help .. thanks in advance !
Here is my setup : a4988 drivers , Nema 17 4.2 kgcm ,CNC shield v3 , Arduino Nano ,Grbl 0.9i , power supply :19v 4a ,configuration : core xy (h bot )