You can save filament on supports if you print the case on its side with the back of the model on your print bed. All the other models should be able to print with minimal to no supports in their default orientations. I printed all the pieces on a standard .4 mm nozzle at a .28 mm layer hieght in PLAusing normal cubic infill. Just consider this, me beta testing the design. Once again, all feedback is welcome. Beware, you may need to lubricate the pieces.
The author remixed this model.
I lowered the height from the V3 case to around 5cm to interfere less with y axis movement, as well as added 1 cm to the side of the top drawer in order to actually slot into the Ender3's smaller y axis rail. The bottom drawers are slightly modified versions of the originals to better fit the new dimensions, and any of the original top drawers should still fit.