You want to ask us to help you invent some tech. We can do that! But you need to understand our limitations.
It's not uncommon for users to ask for help building technology on Worldbuilding.SE. But too many of the questions are challenged, argued over, and closed, because, I believe, the querent has an expectation that we cannot meet. The problem is expressed by an idea that's floated around for several years:
If someone could answer this question in the way that you want, they wouldn't post the answer here, they'd be running to the patent office.
To help you properly set your expectations (and, thereby, to better ask your question), allow me to explain briefly how this site operates.
We don't know how to define a poor question, but we know one when we see it
In 1964 case Jacobellis v. Ohio, U.S. Supreme Court Justice Stewart Potter uttered what has become a famous statement:
I shall not today attempt further to define the kinds of material I understand to be embraced within that shorthand description ["hard-core pornography"], and perhaps I could never succeed in intelligibly doing so. But I know it when I see it....
Unlike pretty much every other Stack in the Stack Exchange galaxy, Worldbuilding is highly creative and imaginative — which means it's sometimes really hard to know when a question has crossed a line. It's beyond the scope of this answer to explain why the lines exist. I can only ask that you trust me that they do and must exist.
"Help me build my tech" questions are not intrinsically bad questions. In fact, they can be among the richest and most rewarding questions asked on the site — but how they are asked and what you expect are critically important because, unfortunately, "build my tech" questions sit on the "rule line." Here are the most common rules "build my tech" questions can cross.
1. We build worlds, not stories
Worldbuilding (on-topic) is the creation and consistent use of rules and systems governing and defining a fictional world of the querent's own creation wherein an infinite number of stories can be placed or told. A world can encompass something as small as a family unit and as large as whole universes and dimensions. Rules and systems can be modified and adopted by many world builders as they build their own worlds. The expression of a rule or system may be unique to the querent, but the rule or system itself can be used by anyone.
Storybuilding (off-topic) is the creation of plot, circumstances, character actions, and character choices. Storybuilding questions usually reflect writer's block or a lack of research on the writer's part. Storybuilding is frequently only applicable to the querent's project and has little or no use to anyone else.
Inventing technology falls into both worldbuilding and storybuilding because how the technology will be used is often a requirement for creating the technology. Engineers will understand what I mean. If you ask us to invent a knife, a thousand knives can be presented to you (and that wouldn't exhaust the design possibilities) — but only the design that fits your story's needs (the intended application) can be the correct design.
The following chart will help you understand what I mean. (You can click on all the images to see a larger version.)
To be fair, if I told you that reddish zone was an accurate reflection of the kinds of questions we'll answer (and not close) it would probably start a fight. But it's close enough for government work. You'll notice that the blue circle representing "help me build my tech" questions is not centered on the cross-hairs and part of it falls outside the reddish zone.
Advice: You can help us a lot by explaining how you will use your technology. What are its benefits and limitations in your story? What are the world rules that affect the tech? The more you can explain why it's important to build the tech the simpler it is to constrain our responses to a solution that will help you.
FYI: Many new users, and sometimes experienced users, will intentionally hide their story or post vague requirements. Sometimes it's because they don't want to reveal proprietary work. Most of the time it's because they think that by keeping the question vague the more likely they'll get a lot of responses to choose from. We call this "fishing for ideas" and it doesn't work well on Stack Exchange. In fact, it'll usually get the question closed as too opinion-based or too story-based.
2. We deal with fictional worlds, not the real world
This is, perhaps, the most frustrating of the issues I'll introduce here. We do not deal with the real world. Period. And telling us that "my world is just like the real world except that it has this cool tech I need help inventing" doesn't solve the problem. You're still asking us to invent something in the real world. To paraphrase The Bard, a pile of manure by any other name will still stink.
Why is this a problem? Because the technology doesn't exist in the real world — and if it did, whomever knew how to design it would be running to the patent office, not explaining it on this Stack. (A lot of new users don't realize just how valuable the invention they're proposing would be!)
Users of Worldbuilding.SE should (indeed, must), with rare exception, expect answers to reflect the fiction of their world, not the non-fiction of the real world. That latitude is necessary, and the more latitude we can have, the easier it is to provide an answer.
Advice: When you ask us to help you build your technology, please understand that while we'll do our best, we cannot and will not provide a real-life, perfectly-scientific answer. If we tell you in the comments to your question that a reasonable answer to your question would more likely go to the patent office, what we're telling you is that you've set your expectations too high and not given us enough wiggle room in your fictional world to answer the question.
3. Finally, there's a weakness in our tag system
There are three tags frequently associated with "help me build my tech" questions:
When I first started using the Stack, my expectation was something like this:
You probably looked at that last entry, Technobabble, and wondered why there isn't a tag. We don't want that tag. We feel it's too much fiction, too much fantasy. We want at least some science in our worldbuilding. (Yes, that's a weakness....)
But to show you the real problem, let me show you a graph that better reflects the Wiki definitions of those three tags:
Remember, what you're asking us to do is help you build fictional technology. The more "reality" you want, the less likely we can help you (or we'd be running to the patent office...). Unfortunately, our current tag structure doesn't easily cover the "answers are permitted to be fictional..." space. We know. It's a pain. But it's also harder to fix that than you might think. What this means is that you need to set your expectations.
Advice: Inventing fictional tech means accepting a fictional answer. If you're expecting a real-world, scientifically-rigid answer, you should not expect an answer.
When it comes to "help me build my tech" questions, we would LOVE to help you out. But you need to work with us, and that means understanding our limits and setting your expectations. The odds are pretty good that actually building what you're dreaming about would require teams numbering over a thousand people and several large corporations (that is NOT an exaggeration). But we also don't want you to leave the experience disappointed. A great experience is somewhere in the middle — and we hope you'll work with us to enjoy that experience.
And hopefully, if one of our users is tempted to post that comment about running to the patent office, they'll post a link here instead. :-)