I built this for my Westfalia Kepler One 2020 but it might fit other models with the same roof-rails system. (Please update me if you tried it successfully!)

You just have to stretch some threads between the two pieces.

I printed it with 4 perimeters and 100% infill so it is super strong. I didn't want to risk it but I presume you can lower the infill and still have something strong enough..

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