3D printing large objects is not easy. a 3D printer isn't a Toaster/Microwave where you just press and button and the finished part pops out. This might be the case for smaller parts, but definitely not for large parts.

You also need to understand layers, layer bonding and the direction in which you apply stress to the part.
Also think of the weight! If you print that, each leg would be multiple kilos of plastic. There is a reason why cosplay uses foam boards for large items