The invention relates to a 2D printing method on a 3D printing support, consisting of forming a printing support comprised of a plurality of colored fibers that follow a printing pattern, which once joined and shaped into a block, can be transversally cut, thereby obtaining printed sheets according to said printing pattern. The invention further relates to the printing support, comprised of a block (1), wherein in one embodiment same is composed of a plurality of hollow tubes (2) having a cavity that can be filled with a coloring means and in another embodiment same is composed of solid tubes. After the coloring means hardens and the block (1) solidifies, the latter can be transversally cut parallel to the printing face (4) into a plurality of strips (5) that will depend on the required volume of advertising signs, posters or banners, among others.