This was cut using Netfabb. You just need to ensure you print with 0% infill and no floors and it will print completely hollow as intended.
I also added a cut version of the LED guide part because it had a base on it probably to help with bed adhesion but not strictly required. It printed fine with no support on my Raise 3D N1 printer as well.
Printed on a Raise 3D N1 @ 0.10mm layer height, 2 shells, 0% infill, 0 floors, 5 roof layers. No support material required.
The pictures show both a 0.1mm and 0.2mm layer height version.