This is a model I created in Tinkkercad based of an original model by http://www.soniaverdu.es/ I found at Support for Dremel 4000 by BQEducacion - Thingiverse. I modeled it to fit a Dremel 4000 with the flex shaft attached, which did not fit in the original model. I also got rid of the back holder on the model originally closed with a screw and nut, and switched to holes to allow you to use a zip tie to secure the back if needed. I printed this is ABS and also modeled a holder for the edge of my workbench to hold the flex shaft attachment itself when I am not using it.