Light Saber Holster

For Halloween, I am dressed as Obi Wan Kenobi. However, my lightsaber does not have a belt clip, so I made this one. This clips to the handle of the lightsaber that I bought at Target.

I really had to scale this up, even though I used dimensions on the original part design. Not sure why. The AutoDesk Inventory file (.ipt) is dimensioned to be a 2 inch extrusion for the overall height of the circular part...so I'm really not sure why Cura scaled this down when I imported the stl file...

If anyone has an answer to that, I would be grateful!