Printed this to hold all of my 3D printing tools. No hardware needed. All components snap to edge of toolbox. Allen Clip On holds all Allen keys that come with a Wanhao i3.
Also if you would like to alter my design, here is the link to my OnShape file. Its public so do as you please. https://cad.onshape.com/documents/e21965a3cd1b7bb1c467b593/w/42fd60e55b70ded27805cd38/e/ef80f57e6bc153389b5024e1