I can send you the STL file for 3D printing. It´s not solid. Only 10 % infill, but 2 mm. shells all over.Any plans to sell them or release the file?
Edit: is that thing solid?
My solution so far (which works fine) is a 9"x6"x4" "yoga block" from Amazon. Had to take a sharp chef's knife and shave about 1/4" off of it to make it 3.75" thick; then it fits perfectly on top of the foam that the factory jack sits in.