The first picture shows the grid cut to fit into the bottom of the ArtBin container and 2 wooden "posts' are going to be holding up the back edge of the upper grid. Glue dots hold the wooden posts in place. The front edge of the upper grid will set on the inside from ledge just about handle height. When the top and bottom grids are in the right alignment, glue dot the bottom grid in place.
Glue dots were put on the front inside ledge and the top of the posts. That keeps the top grid from moving.
Here is my box with most of my markers in it. My blender refill is in the front and my Copic original blender pen is on the side. I later found a front hole that it fit into.
I am excited about having all of my marker in one place ready to go now. I need to give thanks for the ideas and help I had getting this together. I combined 2 ideas I found here and here. And I couldn't have gotten it done without my terrific friend Rebecca who had a razor saw to cut the plastic grid for us. (A razor saw has 25 or more teeth per inch. Razor saws can be found at Art Supply Stores.) If this Copic storage doesn't work for you, maybe you can find a picture here that would work. Just click on the picture you want and go to the blog for more information.
If you would like to see a smaller version of this case, check here. The smaller version holds 186 Sketch and/or Ciao markers.