There are many different materials that additive manufacturing can make things with.  Filament is pretty much entry level hobbyist material.  Most hobbyists start with such materials because they are easy to use.  The next step for 3D printing is using different materials, such as pastes like chocolate, cement, and clay.  These printers are today being made available to the market niches, like baking, where there is demand.  Hobbyists maintain cutting edge development in design of 3D printers, and experiment with wire feed welding, metal powder sintering, and recycling of PET beverage containers for making filament at home.

I think a breakthrough will come when 3D printers are adapted to produce filament from recyclables themselves, rather than using a separate machine to make filament.  It just takes a tape cut from a water bottle and puts it through a nozzle to create filament that can be put through a nozzle to print, so simply putting the tape into a 3D printer cuts out most of the steps and equipment necessary to using recycled PET.

It's primarily a hobbyist field today, and the development of 3D printing itself is decentralized.  It's not particularly energy intensive, compared to household appliances, depending on the size of the 3D printers themselves.  Obviously printers large enough to make large items, like car fenders, or chairs, require larger motors and more energy, but most people entering the hobby aren't making things much larger than a 1/3 of a meter in a given dimension, which is comparable to microwave ovens or televisions.

Hoses are very easy to make with a 3D printer using appropriate filament, but pipes are easier yet, since they don't need to be flexible.  It is mass production providing parts to varied users with different use cases that makes hose so common, but making parts yourself for your specific design enables pipes to serve, and that is as easy as 3D printing gets.  Motors and electronics are mostly beyond 3D printing capabilities at the hobbyist level, but aquarium pumps are extremely common and inexpensive.  LEDs for lighting where sunny windowsills aren't available are also beyond most hobbyists capability, but printing circuits is becoming a specialized segment of the hobby, and I expect LEDs are being printed by those leading the development today.

The rest of an aquaponics system is cups or gutters to hold the plants, and a tank for the fish or crawdads.  It's about the most simple equipment that can be imagined.  It's the application of the parts that is specialized, not the parts.  While most people haven't escaped the indoctrination to buy food, as food provided by legacy industry becomes less suitable, or people become more aware of it's drawbacks, the voluminous information already available regarding aquaponics will be applied by more and more people.  I have run into people with large aquaponics setups nominal for commercial use in their apartments, in my work as a handyman.  People mostly don't understand the simplicity and utility of aquaponics, and that is the primary barrier to widespread adoption today.  As the quality of food commercially available declines, motivation to overcome that relatively minor learning curve will dramatically, and suddenly, increase.