These are fun rockets with boosters that extend on take-off. I designed two sizes and each contain two parts: the main rocket body and the ‘boosters’.

I've included the following STL models:
Large Rocket (complete)
Large Rocket (body only)
Large Rocket Booster Insert (a set of 4)
Small Rocket (complete)
Small Rocket (body only)
Small Rocket Booster Insert 

3D PRINTING SETTINGS
Layer Height 0.2mm
PLA works great
15-20% Infill

Dimensions of Large Rocket: 4in x 2 3/8in
Dimensions of Small Rocket: 3 1/4in x 1 7/8in

*Supports are needed for the larger rocket at the base around the outside rings of the boosters.  (Make sure not to include supports inside the booster chambers because you need to keep those clear to drop the boosters in when you pause the print:)

There are two ways you can print these rockets:
1. Print the complete rocket 
2. For different color rocket and boosters, print the boosters first, print the rocket second pausing at layer height 15.6mm for the large rocket and 30.6mm for the small rocket, drop the boosters in and then continue printing. 

Have fun printing these…they’re a blast 🚀

Plane

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Rocket with Boosters (2 sizes)