3dprinting is also known as additive manufacturing and used interchangeably.

I've always wondered if it's possible to have fully (or close) recyclable materials for 3d printing. Like if i print something today.. tomorrow i can "melt" it down and print something else..

Yes, possible. There are manufacturers selling recycled filament, which were originally waste that they have collected from the consumers, melted and forming the filament used for domestic 3d printers. But mechanical strength of such parts deteriorate rapidly after 1 round of treatment. It is not advised for hobby makers to melt at home... very dangerous..