I make this Gridfinity model to make it modular, you can stack it as much as you can. All you need is super/CA glue for the assembly, I add photo for assembly guide if you need it.

All file can be printed without support, I have tested it but you might need brim.

In the 3rd photo of the assembly there is an arrow pointed for magnet slot, I use magnet from used OXVA catridge magnet, this is optional you can use or not, or you can remix it to your magnet size. 

Also for the drawer door I make optional file without my logo, feel free to remix it.

Hope you like it and happy printing!