Many wallboxes are designed for the cable being looped around the box. Often, the final loop will just flap around, especially when it's windy.

I made a clamp that will hold the final loop close together with the rest of the cable.

The cable on my Heidelberg wallbox is 12.5mm (½"), I believe this is a standard size. I can make other sizes if needed.

I made mine from Fiberlogy ABS. Imho, PETG or better should be fine for this. ASA is the best solution as it's UV resistant.

You need two zip-ties to fasten the clamp to the cable.