The Estes fin alignment guide is a tool that I use quite often here in the AAEN Fabrication Shop. It comes with three cardboard motor casings. They are 13mm, 18mm and 24mm in diameter. Due to the cardboard casing I have run into issues such as the cardboard casings wear and move around. If the model has large swept fins, the cardboard casing don't extend high enough. Lastly there is no 29mm casing.

I used Tinkercad to create a series of casings that I could print on my Ender 3. I also created two holders for all of these casings. The first stand is just used to store the casings. The second base holds the casings, along with the fin alignment guide base, fin tabs, and clips.It is possible that I may expand on these casings, especially if I start to build a model that needs a taller casing.

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