3d printers have so many different kinds, such as 3d color printer, digital camera printer, digital copier printer, digital photo printer, solid ink color printer and so on. Most of us do not familiar with the 3D printer price and the cost. We all want to find cheap 3D printer. The future challenges for this technology (3d print, 3d-printing) are the following:
• Working with new materials which characteristics are close to the "operational": see directly into the final material.
• Simplify the interface between CAD and the 3d printer, which today remains complex (cleaning of files, "layout" of parts …) 
• Work faster and does more, to make rounds in industrial quantities, to make this tool a real production tool and not prototyping 
• Lowering the costs of machinery which is over 20 000 € for today.
• Improve handling of colors (It exists, but still weak …)
Therefore, it is likely that many areas will be revolutionized by this technology, and, who knows, perhaps the mass market!
Digital 3D color printing is a new fashionable trend. Digital solid prints are favored by public.
The 3D printer is probably far ahead from your PC.  There even exists desktop 3D printer. It is magic, right?