Testing new designs of computer's in space how they are made. printed, encased, connected, how plug ins work, what is a plug in . changing shapes of things, what elements can be used. how t printed the entire system form a machine. and push it into a console in space ergonomic shapes. Print and write circuits as you print with installation process so the whole thing is a solid piece of tech (thermal dynamics dissipation of thermal in formation ) one solid piece.
I have a couple of ideas, probably totally impractical as stand alone businesses, probably best as minor incidental side lines to some other more substantial businesses.
1. This one is dependent on some kind of regular earth-moon transport. There are lots of rock collectors on earth. Many would jump at the chance to get an authentic piece of moon rock to add to their collection. The big question is can it be done at a price that won't break the bank. Cost may make this impractical
2. This one is really kind of a silly novelty item. A cubic cc of space in a bottle. Again probably totally impractical.
I think (1) is a non starter as long as we are getting Moon rock delivered to us from meteorites but that might be running out. At more than $10 per gram it is fine when it arrives here FOC but it might not turn a profit if you have to go get it!
(2) is a nice idea, but rather open to the con artists who could sell you a tiny bottle of polluted air for $100 per ml.
If you get some better ideas, patent them first.
Taking patents is not that difficult or expensive (I had lots). It is enforcing them that is the problem. A non-scientist friend of mine had the idea of pinning pairs of sock together in the wash. Great, but to enforce your patent you would have to get search warrants and visit people's homes on wash day!