According to the legend of Star Wars, the lightsaber or Lightsaber it is made of Kyber crystals. In the real world, crystal (unfortunately) doesn't exist, which means that if someone wants to make a lightsaber, they'll probably have to find the right material, or think of something else.
Thus from time to time we have seen swords made with laser, or simple light.
The following case is a completely different approach, since it uses a steady stream of fire.
Electrical engineer Allen Pan built a functional lightsaber whose "blade" is made of fire.
As you will see in the following video it does not have the same glow as the super duper swords appearing in the movies, but there is no doubt that it will burn you with the slightest touch.
Evidence;
Pan in the video tries to light up cigarette with his gun.
The sword uses a mixture of methanol and acetone as a fuel. The same materials are also used to help butane to flame up or forward.
If you think of this particular "weapon" for a duel, you will probably be disappointed, as the flames will not collide, but will enter each other.
Watch the video