There’s a button “Order this printed” on the lower right of the preview image. You might want to try this out.
You could also use an online 3D printing service like 3DHubs after downloading the required files. They do have a wide range of materials to choose from.
Last possible solution: I would be willing to print this for you (to bring my 3D printer to good use).
I don’t have semi-transparent filament. You would have to go for one of the colors I’ve got here: Black, white, silver, or blue.
I can only print in PLA, which is not as elastic as you might be used to from the original FP1 phone case.