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PA12 3D Printed Fin Assembly

Intended for subsonic flights!

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4-fin modular fin assembly intended to be used with a minimum diameter high-power rocket. The assembly can be bolted onto the airframe and then flown.

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Assembly is 3D printed on an industrial HP5600 Multi Jet Fusion (MJF) printer.

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HP 3D High Reusability (HR) PA 12, enabled by Evonik – Nylon based material known for high strength, durability, and chemical resistance. Great for applications where strength, durability and precision are essential like automotive, aerospace, and consumer goods.

PA12, also known as Nylon 12, is a high-performance thermoplastic polymer used extensively in industrial manufacturing, particularly in 3D printing and engineering. It is a long-chain aliphatic polyamide derived from petroleum sources.

The “12” in its name refers to the number of carbon atoms in the monomer (laurolactam), which gives the material unique properties compared to shorter-chain nylons like PA6 or PA66.

Components are both Dyed Black and Shot Peened to create a smooth scratch proof surface. Read more on the HP site.

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HP Multi Jet Fusion (MJF) represents the gold standard for moving beyond simple prototypes into functional, flight-ready aerospace components.

Unlike FDM or SLA, which often suffer from layer-line weakness or material brittleness, MJF utilizes a unique powder-fusion process that creates isotropic mechanical properties, ensuring your parts are equally strong in every direction – a critical requirement for components facing high-stress aerodynamic loads.

By eliminating the need for support structures, MJF allows for the production of complex internal geometries and consolidated assemblies that are impossible to machine, all while providing a professional, matte finish and the durability of engineering-grade Nylon.

Whether you are producing specialized rocket fin brackets or intricate motor mounts, MJF delivers the speed of a production line with the precision and ruggedness required for high-power rocketry.

Models Offered:

  • We have developed and tested the “3-inch” version – and will fit airframes with an OD = 3.130

Future versions:

  • For 54mm airframes
  • For 38mm airframes

Recommended Use

For high-speed flights it is HIGHLY recommended that the fin assembly be epoxied onto the airframe. This will create a really strong bond between all assembly components and the airframe. Using epoxy will also fill in potential (small) airgaps that can exist between assembly components as well as the airframe. 

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