Second proper model, first try with openscad! It's a rocket motor tester, allowing you to not have to risk jamming a motor into a rocket, only to find that it doesn't fit!. 

SirPoppyThFatCat

Rocket Motor Fit Tester - Estes/Klima/Aerotech/ETC

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3DLAC Plus Holder - Gridfinity 

First proper model on makerworld that wasn't a complete failure :D

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