Print the LIGHTSABER-TEMPLATE.stl from them.
The template fits inside the hilt of the lightsaber. I ended up just cutting off the top/floor/base of the template after it printed and kept it in the hilt so a new blade could be printed instead of a new template when switching blades.
Remember to come back and post what you've printed as Make.
It's good for the designer and the community (that means you)!
To post a Make, come back to this Thing and click Post a Make.
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and the Apple App Store.