What type of filament can be used in 3d printing?

Is there a Limitation to what shapes you can 3D print?

is it food can be used in 3d printing?

How large of an object can print using 3d printer?

is the material of 3d printer expensive?

what is the most important part of 3d printer?

what are the main problems with 3d printer?

Is there a limitation to what shapes you can use 3d print?

Is there any limitation of shape to use 3d printing?

What type of material can you print?