This is a tool holding bracket that clips onto an IKEA LACK table, or it can be screwed in somewhere if need be. I haven't had any trouble with it coming un-clipped, but the counter-sunk screw hole is there just in case. The bracket part of this thing has 12 square holes that can be used to arrange the accompanying modules in many different ways.

Each of these modules has two sets of flexing, square-fitting feet and one square hole on top so that modules can be stacked two deep for extended tool-holding ability. I am including the SketchUp file so anyone who wishes to add more tool-specific modules can do so easily.

Finally, the square holes on the bracket portion are close enough to the edge that modules can be used to connect adjacent brackets. I have only printed one, so no pictures of this feature yet.

I hope to add more tool-specific modules in the future when I figure out what they could be.

UPDATE: I cleaned up the sketchup file and added labels to clarify what is what and why it is there