This is a 3D printable model rocket capable of accepting Estes 24mm D or E engines. Each module features twist-lock couplers making it easy to assemble, disassemble, and repair. Simply slide two modules together, then twist clockwise until they click together. If each module is printed separately with a fixed Z-seam, the Z-seams should line up.

The rocket in the thumbnail is made up of

• (1x) 2in x 4in Long Fins with 24mm engine holder
• (1x) 2in x 4in 1-8in Launch Lugs
• (1x) 2in x 4in Fuselage
• (1x) 2in x 4in Nose Cone Adapter
• (1x) 2in x 4in Nose Cone
• (1x) D engine spacer (not needed if using E engines)
• (1x) 24mm engine tube cap

The nose cone accepts a 1-1/8" eye hook for attaching the shock cord. The other end of the shock cord can be attached to the inside of a nose cone adapter module using Estes' method:

You then can attach your parachute to the shock cord or the nose cone eye hook.

The nose cone is deliberately a bit snug in the nose cone adapter module to allow it to be sanded down to a perfect fit.

Happy flying!