Print these 4 sections and link together with push fit links. Then remove all dividers from drawer and lay this in the bottom. This will give you a 9x7 Grid for any gridifinity set you want. 

Technically you can mirror just one part multiple times or you can choose the marked A, B, C, D file. It is broken into 4 sections to fit on most printers. 

Printed with default settings in PLA on X1C with .28 layer Height and it comes out perfect