Gnat Model Rocket

The Gnat is a 3d-printable model rocket in a compact 3.8-inch frame. Engineered for the A3-4T engine, this rocket delivers thrilling flights, reaching altitudes up to 750 feet. Featuring tumble recovery for a safe return, this mini rocket is perfect for enthusiasts of all levels, though its small size and high performance demand close attention during launches to track its soaring trajectory. Luckily with the ease and low cost of 3d printing, losing one doesn't sting so bad.
 

Printing

This rocket can be printed in any plastic and is specifically designed for a 0.4mm nozzle. However, if printed with PLA it will be a one shot rocket. In order to make the rocket reusable, you'll need to print in a higher temp plastic such as PETG, ASA, or ABS. Using PLA will cause the recovery charge in the engine to fill the body cavity with hot gasses that will melt the rocket. 

Recommended Plastic

Because of the very small surface area touching the build plate, make sure it is very clean and use a brim when printing. PEI build plate recommended. If you have difficulty getting the prints to stay attached, wipe the plate down with steel wool (#0000) and wash with Dawn Powerwash. Be sure to NOT touch the build surface or rub it against anything that may have oil. If you do, wash it again.

Assembly

Glue the nosecone into the body. That's it!

The rocket will use tumble recovery after the engine is ejected. Glueing the nosecone in will allow for the engine ejection.

Flying

Use a A3-4T, A10-3T or similarly sized engine. Insert it all the way until it snaps into place securely. Follow standard launch procedures and safety guidelines.