Replicators are more of a staple of Star Trek than other franchises. As we’ve seen in Star Trek: Picard, DS9 and Voyager, the fun concept can be a bit limiting to plot and characterisation to the extent that later versions of Trek find ways for people to cook and make stuff without the use of a replicator. Jean-Luc Picard’s brother refused to have a replicator in the house, carrying on a family tradition. So while they are a fun idea, I’m not surprised they haven’t caught on in science fiction quite so much. If anything, they make stories just a little more dull without adding many interesting dilemmas (either practical or moral).
Mur Lafferty’s Six Wakes took a different spin on the notion of a food replicator to imagine a kind of 3D printer that can assemble organic objects. The same technology (or something very similar) is used to create new versions of the crew.
The Six Wakes style replicator strikes me as a concept we might start approaching. There are already ways of printing some kinds of food and I can imagine that becoming gradually more sophisticated.
Star Trek replicators are interesting though. Presumably they work using the apparent mastery of manipulation of mass-energy that the Federation has. I’m sure the mechanics of them have been explained within Star Trek lore but let’s speculate about replicators we could create if we have imaginary technology.
- Rejigged teleporters. Teleporters of the fax-machine style disassemble matter into energy and then store the pattern in some sort of buffer system. Infamously, they can be turned into copying machines. Switch off the safeties and build some more permanent buffers and you have a replicator. Want some earl-grey-hot? Make yourself a cup and then teleport it away. Then teleport it back to the same spot. Now the cup of tea is permanently stored in the buffer and you can re-teleport it back whenever you want a cup.
- Analyse and recreate. This is conceptually a cross between the 3D printer idea and the teleporter. You need command over the very nature of matter and energy but this time you have a machine that creates a digital model of earl-grey-hot by scanning lots of cups of tea. The advantage of this is that you can change parameters like tea strength or temperature and also combine models e.g. replicate your earl-grey-hot in a wine glass or a nice cab-sav in a tea cup.
- Read minds. I’ll assume we have some magic and what we want to access is the platonic ideal of a early-grey-hot. Access the higher realms of reality and use your magical power to bring an instances of the ideal cup of earl grey into the mundane world. How to find that ideal cup? Well, the world of ideals is concepts so you just have to look deep into the minds of people who like a nice cup of tea and grab their concept of a nice cup of tea…and so on. It’s easy from there…
- Use time travel. This is theft and surely breaks all sorts of laws of conservation of mass. Use a time machine to take a cup of tea from the past. Drink the cup of tea. Now, use your time machine to go back to the point just before you stole the cup of tea from the past. Steal the tea again but don’t drink it. Instead, send the tea back into the past to just AFTER you stole the cup of tea the first time. Yes, yes, I know, somehow that doesn’t all add up.
- Buy tea bags and a decent electric kettle. This only works for creating tea.
- Digitise your brain. You now exist in a virtual world. Pay developers to make virtual versions of a nice cup of earl-grey-hot. Wait. The developers get back to you explaining that there are delays in the next sprint. Wait. The user-acceptance-testing version of the product is sent to you with a 13 hour turn around. The developers appear to have made a beer glass full of sputum. Explain that it isn’t what you asked for. No, no, you have to lodge a Jira ticket. Wait. Get frustrated and ask why is the cup-of-tea project delayed. The developers explain that you changed the specifications and they need to re-code the whole thing. They send you a bill for the extra time. Repeat this process multiple times. You end up with a saucer of apple juice. You drink that instead.
- Build a vast planet of robots. The robots create vast quantities of stuff. Use transdimensional wormholes to access the stuff but claim it is replicated.