This is the same clamp as used in the Anakin Luke ANH inspired lightsaber WIP by jodroboxes but I have added knurling like in the real thing just for a little more detail and I think it adds a lot to the end looks.
Original model was from jodroboxes http://www.thingiverse.com/thing:1232990, I just added the knurled ring.
I printed at 0.1mm to get the detail of the fine knurled appearance but should also work fine at any other layer height. Infill does not matter as long as you do a 1.2mm wall as it does not do the infill for most of the print due to it being thin.
Used the STL from jodroboxes and used SolidWorks to add the knurling.