Printing of 3D requires one very important technique. It is essential to have the print contain "2 separate images" -- one for each eye of the viewer. Lenticular prints accomplish this by having the original photograph or graphics images created to contain the 2 images; and by then having a special lense (lenticular sheet) laminated to the image print (or using methods to direct-print to the lense itself). While this process is obviously more expensive compared to normal printing, the cost is far outweighed by the multiplied impact of 3D images. It is crucial however that only experienced companies be engaged for any 3D work.