Rear Ejection Bomb Rocket

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There is a newer version: https://www.thingiverse.com/thing:3920822
The new version uses an Estes BT-60 body tube in place of the paper towel tube used in this design, which makes for a slightly better rocket.
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PRINGLES CAN WARNING: Pringles changed their can's recently. The new cans have the same outsi