This is the standard style of cross guard for Rawlings synthetic sparring swords. They're prone to break during use, so you may want to print replacements. I haven't printed it yet, so I can't guarantee it will fit.
This is not a perfect copy of the original cross guard, but the dimensions are pretty close. The main shape of the guard is defined by the intersection of two different views, one in profile and one from the top. So if you replace the .dxf files with your own, you could create different shapes. The .scad file may need to be modified if your design has different proportions.