Gridfinity Shelf

This is a 3x3 gridfinity shelf, It has a drawer space of 3x3 maximum and can slide gridfinity units in and out. The top space is also 3x3 and a traditional grid. On the bottom is a 3x3 base to stack shelf units on top of eachother.
Listed in the files are the FreeCAD files that the following STL file came from, feel free to edit this piece, but please post it as a remix so thingiverse may benefit.

GRIDFINITY NOTE:
while you can stack these shelves on top of eachother, you CANNOT pair them side to side, because the walls of the design prohibit this.

TYLER'S PERSONAL NOTE:
This is a design made after my first year of engineering school! Many principals have been taught and are quite invaluable. If you are inspired by the many things made on this site please consider going to school for this. If you want more variations of this design please let me know