Parametric Rocket Fin Alignment Guide / Jig

Update 7/2: v2.0 - Now with sleeve option for attaching fins on different places along the tube.

I wanted to make it easy to attach just about any number of fins on just about any size rocket tube, and so I came up with this fully parametric model. You can even print one that supports different numbers of fins at the same time (e.g. 3 and 4 -- see photo).

It's smart about fin alignment, too, providing internal support where the fin is attached, and offsetting the guide block to compensate