on demand inkjet printer such as a bubble jet thermal jet or piezo printer or a continuous inkjet printer such as a hertz mead or sweet type printer specific examples of printers that are preferable for use include those having the capabilities described in jp a 2000 190467 referring to fig3 printing onto a surface of a golf ball box or golf ball packaging medium 100 is typically performed by placing the golf ball box or golf ball packaging medium 100 on a feed tray 30 and thereby carrying it through a printing position t in a printing unit 40 equipped with an inkjet head 41 the tray 30 can be raised and lowered in the direction of the arrows in the diagram by a gap adjusting mechanism not shown in this way the size of the gap between the inkjet head 41 and the golf ball box or golf ball packaging medium 100 can be held constant at all times no particular limitation is imposed on the ink used in the inkjet printer for example use can be made of a water based dye water based pigment oil based pigment water based thermosetting acrylic pigment solvent based pigment or ultraviolet curing pigment generally a water based ink can be used from the standpoint of durability a pigment type ink particularly.