I developed this accessory with a friend of mine (Florian Aute alias Soulnight on Reddit and Eleven) who regularly plays the game Eleven table tennis VR on Oculus.
The game physics are amazing and we wanted to recreate the feeling of holding an actual paddle in the game. This way you can improve your skills in the game and then use them in reality.

We started with the following requirement list:

• The center of gravity should be at the same location as the real paddle
• The total weight should be in between 160 - 190g
• The buttons on the controller should be accessible while on the paddle
• The handle should feel like the real paddle
• There should be space to place the index finger on the back of the paddle (shakehand hold)
• The sensors ring should point towards the Oculus to avoid occlusion and tracking loss
• The controller should be easy to fit / remove and keep at the same position every time

The final model was printed with the following print settings:

• Layer height: 0,2mm
• Wall thickness: 0,6mm
• Infill: 20%

The printed model fits perfectly around the controller. The hinge requires some additional work to make it work smoothly.
Together with the Oculus Touch and the Eneloop lite battery, the total weight is 167g (180g with Eneloop pro).

Additionally you will need 2 M4 screws and nuts:

• 10mm (thread length) to lock the controller in place
• 35mm (thread length) for the hinge

EDIT: The game has a preset for the accessory under the name VR-Adapter. See video here: https://youtu.be/E8tJBQ-aS4E

The original post on reddit are:

• Video: https://www.reddit.com/r/oculus/comments/fbiadx/oculus_touch_vr_paddle_accessory_for_eleven_table/?utm_medium=android_app&utm_source=share
• Development journey: https://www.reddit.com/r/oculus/comments/f3g8yz/eleven_table_tennis_a_journey_through_prototypes/?utm_medium=android_app&utm_source=share

Thanks to Aolshove on Thingiverse for the 3D scan of the Oculus Touch: https://www.thingiverse.com/thing:3729872