The M3 screw on the left X bracket is the Z height adjuster. This screw sets the first layer height. A more detailed explanation can be found here in our wiki: Adjusting Height on Your Airwolf 3D Printer
The M3 screw on the left X bracket is the Z height adjuster. This screw sets the first layer height. A more detailed explanation can be found here in our wiki: Adjusting Height on Your Airwolf 3D Printer