Model Rocket Fin Jig (4 Fins)
cults3d
I have a series of fin jigs to help you line up your rockets fins on several common body tube sizes. BT-50 (24mm) 29mm BT-55 BT-60 BT-70 BT-80 All of these are spaced out for 4 fins. The spacing is 5mm (.19685") for width of your fins. The Inner ring is exactly 1mm larger than the outer diameter of the body tube so these will be a tight fit. I do this on purpose with the intention of filing the diiameter until it gets as tight or loose as i want it. Afterall it is much easier to file a bit off than it is to add more once printed!
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