Belt sleeve for a 1" nylon straps as seen on the ODST's featured in the Halo 3 short-films directed by Neil Blomkamp
May need to be rescaled since Blender doesn't like to keep the scales when exported.
I have not tested it, but I'm going to assume it is printable since there were no issues that I saw in the layers demonstration.
Update Got some feedback on the model. I suggest scaling the model 1-2% bigger for FDM printers with big tolerances as the 1" nylon strap may get caught passing through the opening.