Straw rocket! 

Remember how you used to tear off part of the disposable straw wrapper, then you could blow into the straw to launch it across the table? 

Remember how you couldn't get the wrapper back on the straw to do it again? 

Enter… STRAW ROCKET! The re-usable straw-launched toy!

It's a quick, easy, cheap print that you and your kids can enjoy!

This fits a standard 6mm diameter straw. But you can increase or decrease that in the slicer if you need to. 

After printing, I'd suggest manually inserting and removing the straw a few times to remove any stringiness inside the tube and decrease friction for when you go to use it. 

To use, just insert a straw into the bottom of the rocket, blow on the other end of the straw, and away she goes!

I tried to make it quite light and with a blunted tip, but for safety never launch at anyone!