Creality Ender-2 Stand

You will need to print

s3d_base.stl x 1
s3d_top.stl x 1
s3d_left-right_wall.stl x 2
s3d_corner.stl x 4
s3d_front_with_vent_wall.stl x 1
s3d_front-back_wall.stl x 1


The will produce the case with blank wals except for the front.

Adding vents:

s3d_left-right_wall.stl
s3d_front-back_wall.stl

are essentially just blanks and will print as solid walls. I suggest that as a fun exercise, that you put these through Meshmixer or similar and make your own decorative vent holes!
I'v