Pencil Pen Marker Tool Holder Wall Mount

I was in a mood and drew this up in a hurry. Turned out alright I think.

There are 36 spaces, each one is 12.5mm x 12.5mm to hold a variety of things. The larger space on top will hold most pencils/pens/markers/tools about 165mm or less in length.

I've included an IPT of the model (Sorry folks, I work in Inventor) in case someone wants to make some changes for themselves.

In retrospect, I probably would have added more squares, and maybe shortened the height of the big top "cubby" spac