Looking for a good 3D printer with good support Im looking at the Robo3d and others

[curious aardvark]

right - first thing you need to do is start thinking in millimetres :-)

Second download cura and load and slice some models to get a feel for how the whole process works. No printer needed.
https://ultimaker.com/en/products/cura-software

If I'm making very strong walls for a box, I make them 2mm thick.
The walls on this little gadget are 2mm
https://www.youtube.com/watch?v=LJq_4QiewWw
Pretty strong :-)
Uses 7 grams of plastic to make.

So a hollow speaker cabinet with 2mm walls would not use much plastic at all.
Also any 'solid' object you print - won't be. It'll have solid walls and a sponge like interior that makes it strong but usues very little plastic.

The robo3d looks like decent pirnter - can't think of any negative reviews.

they say 1000 grams divided by the weight of item is one one.

that's just gibberish :-)