Until there is something official/professional, you can always use https://sugru.com/

I too already dropped mine. I would like to design one for 3D printing with flexible filament. It would help a great deal to have a .stl file of the casing to subtract it from my design. The outside surfaces would do. Any chance we could get this?

hey guys, maybe this will help a little: http://www.thingiverse.com/thing:817716
Maybe not exactly what you wanted, but it might be a start. Towards the end there is a link at tinkercad to download or edit for 3D printing. Let us know if you end up with a rubberized case/holder design.

By the way, I think the author, Julia Truchsess, has posted here in this forum in the past.

— Duane