<p>If I need to 3D print a hollow box that can not have any light permeating into the box, what would be the best course of action? Should I 3D print the hollow box as a whole or print out the 6 sides individually and put them together at the end? And if I do the second option, what would be the best way to put the pieces together (design/connect grooves or use glue)?</p>
<p>I am very new to 3D printing so any feedback would be very much appreciated!</p>

Print it as a whole object
Use 20% infill.
Profit!