Connecting to 3d printer based Mega2560

[yuvalmaimona]

I have a 3d Printer which i would like to connect.
the printer is Wanhao duplicator i3 plus, the project is converting it to 3 axis motorized stage.
the chip is from Atmega, and on google search i saw that its board is equivelent to Arduino mega 2560.
According to the datasheet of tre printer it uses Repteir.
i tried the following python code:

threeDPrinterData = serial.Serial('com5',115200)
print('please wait, the device will reset in a few seconds')
def query(msg):
    msg=(msg+'\r\n').encode()
    threeDPrinterData.write(msg)

# we need to wait a little bit in order
# to receive the output
    while threeDPrinterData.in_waiting == 0:
        time.sleep(0.5)

    response = ''
    while threeDPrinterData.in_waiting > 0:
        response += threeDPrinterData.readline().decode('utf-8')
            #time.sleep(0.5)

    return response

try:
    
    time.sleep(15)
    #Start Gcode
    print (query('G21'))#metric values
    print (query('G90'))#absolute positioning
    print (query('M82'))#extruder absolute positioning
    print (query('G28 X0 Y0'))#;move X/Y to min endstops
    print (query('G28 Z0'))#;move Z to min endstops
    print (query('G92 E0'))#zero the extruded length
    time.sleep(15)
    #Main Gcode
    ee360=32.1
    zz=50   
    while (zz<=50):
        print (query('G1 Z'+str(zz)+' F2400'))#move to 0.5mm in Z zxis with 2400 mm/min
        time.sleep(5)
        print (query('G1 X0 F2400'))
        ee=0
        x=0
        while (ee<360):           
            deg=(ee360/360)*ee
            print (query('G1 F240 E'+str(deg)))#metric values
            time.sleep(7)
          
            time.sleep(1)
      
            print (query('G1 X200 F2400'))#move to 200mm in x zxis with 2400 mm/min
            time.sleep(4.5)           
        
            time.sleep(3)
            print (query('G1 X0 F2400'))#move to 0mm in x zxis with 2400 mm/min
        
            time.sleep(3)       
            x=x+1
            ee=ee+1
        zz=zz+5   
  
finally:
    #End Gcode
    time.sleep(1)
    print (query('G28 X0 Y0'))#;move X/Y to min endstops
    print (query('G28 Z0'))#;move Z to min endstops
    print (query('M84'))#;steppers off
    threeDPrinterData.close()

The software manages to open the connection to the printer, however i can't get the rest of the code to work.
thanks for your help!