EDIT: I've added shorter version (200mm) + extension tube (another 200mm) so you can print on smaller printers and glue this two elements together.

The first launch in slow motion - https://youtu.be/SDTpYEJABq8

This is a fully printable rocket model that can be powered by 12mm,16mm or 18mm rocket engines. It's been tested with 12mm A-class and 16mm B-class engines. The "fins" are slightly angled to generate rotation and improve stability.

It was designed to be printed as in corkscrew / vase mode, so the whole model is a single path - that is why the STL files are SOLID. They become a "shell" by proper settings. The only thing to be printed in regular mode is the engine adapter.

Happy launches!