This is a longsword trainer for HEMA practice. The stats suchs as the length of the handle, the parry, the weight and the center of gravity are taken from the SIGI King. However, the center of gravity was quite hard to get right, so now it is about 5 cm from the handle, as shown in the CoG.png and I had to shorten the handle about 1.5 cm to make it fit on the buildplate. The idea is to fill party ballons with water and put them in the spheres at the top and bottom or fill the spheres with plaster of paris to create the total required weight. The diameters fit for 850 g water / plaster of paris in the top sphere and 150 g in the bottom sphere with a medium density of ~1000 kg/m³. The two sword halves can then be tied together with tough string through the holes in the handle and at the spheres. The trainer is quite big, but it just fits on a Prusa XL buildplate when rotated 45°. I also recommend printing the spheres with higher infill than the handle, just to make sure it is structurally sound.
There is an additional file if you plan to glue the two halves and do not need holes and groves for string.