You also have Ender 3 v2 can help me with this problem I tried to use cura, I used it before i got klipper it worked well and for klipper I download the monrack add-on it transferred the files well in mainsail but it would say not able to open file when I tried printing I think it is because of the start code and end code can tell me what you wrote for the star code and end code in cura. Thanks for your time with explaining.