There are two flavors of plastics printing.
Type 1 is called “Filament” printers.
These use 2.2 pound (or smaller) rolls of meltable plastic filaments. Which plastic? Well, there’s a long discussion that will have its own page one of these days.
One type is PLA – which is not hard to work with, but is soft and not food-safe. Then there is ABS (and other styrenes) which are stronger, but you may wish to install positive ventilation because of chemic al smells. There are also food-safe plastics in case the Dollar Store is too far and you just gotta print up some plastic dinnerware…
Example to look at on Amazon: Comgrow Creality Ender 3 3D Printer Aluminum DIY with Resume Print 220x220x250mm.
Type 2: These are called “Resin” printers.
They use a thin stream of UV-curing plastics (like what your dentist may use).
These will generally have a smaller build area, should be vented, and produce (depending on resin) harder plastics. Which means they also cost more.