thingiverse
This is a model rocket body and top. I think it's designed to use an F engine. Be careful, make sure to add a parachute. Print and use at your own risk.
The tube piece is designed to take multiples and put together - print in vase mode with 2 layer shells. I had great luck with PETG
Direct link to the original creator's page
Click the "View on thingiverse" button above to visit the original model page on thingiverse. You can download the STL file directly from the creator's page for free.
This STL file is compatible with most FDM 3D printers (Creality Ender 3, Prusa MK3S+, Bambu Lab, etc.) and resin printers (Elegoo, Anycubic). Check the original page for recommended print settings and materials.
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Most STL files can be modified using free software like Blender, TinkerCAD, or Meshmixer. Check the license on the original thingiverse page to see if modifications are permitted by the creator.