Printing for shell scheme stands can be done on various materials such as PVC, Foamex and banner, depending on the type of display required. Here are a few printing options for shell scheme stands:

1. Shell scheme graphics: Shell scheme graphics are custom-made panels that fit perfectly within the frame of the stand. 

2. Large format printing: Large format printing can be used to create banners, posters, and other marketing materials for your shell scheme stand. These graphics can be printed on a range of materials, including PVC, fabric, or paper.

When choosing a printing method for your shell scheme stand, it's important to consider the durability, portability, and ease of installation of the display.