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UPDATE: We are no longer 3D printing these in ABS. We are only providing the stronger ABS modled adaptors.

we have a few left but have moved to recommending the ABS adaptors as they are much stronger. 


Designed by us on a 3D printer. This is a PLA plastic 3D printed adaptor.

The PLA plastic is a material that is relatively easy to manipulate. If it is too large you can cut or sand it down for a better fit. If slightly too small you can use shims for a tighter fit. You can also use a lighter or heat to flex or remove any burs or sharp edges.


There are 4 types.

1. The slide in adaptor fits into most inflatable boards with a slide in fin.

2. The kayak/canoe adaptor can be strapped around just about any board, canoe, or kayak (straps not included). Made for a slightly rounded bottom watercraft. Can be used on a SUP but can result in a ‘loose’ fitting. You can secure an object such as a pool noodle under the adaptor to give the bottom some contour and allow the straps to ‘pull’ into it and provide a more stable fitting.

3. The Flip Lock is designed to fit into inflatable paddle boards that have the Flip Lock type of fin box.

4. Reverse Fin Screw - found on older inflatables. The fin bolt is found under the arch or the back of the fin instead of in the front of the fin


The adaptors are printed on a 3D printer with PLA plastic. This is not a strong material so please take note of the cautions below to ensure your adaptor lasts. If you have any questions or issues, please contact us.

  • Never leave in direct sunlight, in a hot car, on a hot surface, etc. The plastic can melt.
  • Never leave the fin/motor in the adaptor attached to the board out of the water. The weight of the motor alone can break the adaptor or damage your fin box. Also do not lay your board bottom down or on its side resting on the fin while in the board.
  • Check water dept and for any objects underwater. Running aground or into an object can damage your adaptor and efin.
  • If the adaptor needs a slight adjustment, you can use sandpaper or tape to shim. You can also apply heat from a lighter or heat gun if you need to flex the plastic or smooth out a sharp point.



Do not use in shallow waters. Do not store in vehicle or an area with excessive heat. Do not leave in direct sunlight. Do not leave installed in board with fin while not in use in the water.

The adaptor is printed in a random color (usually blue, white, or black)



eFin Adaptors (PLA 3D printed)


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