Was searching all over for a good lasered GRBL case set of files on thingiverse, and could not find anything with a fan.
Closest set of files I could find was a stl without a fan and the USB hole was a fraction too small.
Imported the stl into DesignSpark Mechanical, converted to a solid, edited it and exported again as dxt and included the solid files.
The stl file looks like it was made with a fairly good program as it converted back to solid without missing facets or errors like what happens when converting solidworks stl exports.
It still needs a terminal block and exit for the stepper motor wiring but the CAD files make it a good start for someone to take it over.