Issue with the home 3D printers is that they don't print with high resolution, at least yet.
While you can make a soda bottle, (or anything else you want) the part will need a fair amount of clean up to look presentable. IE: while the part is still one piece, because of a lower resolution to the part, you can alot of times see the layers of plastic on the part as it is built.
Nothing that a little sanding and putty can't fix, but depends on how much time and effort you want to throw into it.
Something like items from Shapeways, are done on refrigerator size printers that cost north of $15k, and the quality that they put out, just can't be matched in a $500-$2000 desktop 3D printer.
But....like any technology that has come along, the desktop versions will get better and better, for less and less money, so eventually, you will have a desktop printer, that puts out the quality of the larger machines for the price of the desktop ones are today.