Mount for the Greywater Key of the Hymer Grand Canyon S

Edit: 

I redesign the Key-Mount as I had issues with the original design when it came to long-term strength. The new design is available here:

https://www.printables.com/de/model/966100-hymer-grand-canyon-greywater-key-holder 

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Original description:

Use at least 40% of infill for added stability. I used double sided tape to mount it in my camper van.