A basic model of the buster sword from Final Fantasy including an assembly version made of 11 parts connected by 8mm support rods, 2 640mm long 1 1260mm long and one 1100mm long

the full sword is an overall of 2 meters long including the handle but can be scaled down although support rods would have to scale down proportionally - this is one big sword (according to the CAD model if made of steel it would be 45kg - I recommend printing it with a decent wall thickness and about 20% infill giving it an overall weight of about 2kg without and 3.2kg with support rods - you can also try printing the blade with less infill then the handle nad conenction so that there's not as much load on the handle - without the 2 handle support rods it will take some decently strong glue to keep the handle on simply because of how thin it is for the massive blade)