Can light-sabers be made?

a practical weaponizable sabre would probably not be based on lasers but a chemical powder like whats on arc welding rods and joined to a signal flare.

Sort of- there are technologies similar to that but with some drawbacks:

A laser is a beam of light and would behave like one- it would be invisible unless it was hitting something or you were in a fog bank. the "blade" would also extend out infinitely, so you wouldn't want to use it indoors. also, beams of light can;t "hit" one another- two lasers swung at each other would pass right through. You can test and see these problems for yourself with any laser pointer or flashlight.

Something much more "lightsaber"-like that would be visible, of a set length, and could "hit" similar devices would be plasma trapped in a magnetic field. The only drawback to this is that plasma is so bright and hot that it would instantly blind and give severe burns to anyone close enough to hold it.

With current technology, either one of these solutions would require the user to carry around several inconveniently large buildings in order to supply the power needed for them.

no, getting a laser to stop at 3 ft is the problem. anything traveling the speed of light doesn't just stop without a mirror or something on the end of that light saber. so you can't stab with it because you would damage the reflective end and it would no longer be a saber. right? a hand held laser that burns something is doable in the future at some point.

I would imagine the thing would have to be made from plasma rather then a beam of light, and some way you'd have to bent it into a continuous loop of plasma. So, yes if we worked at it

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Dunno but it would be bloody mint if they could