Here is the .stl file from solidworks import of the .stp file, it should be just the same.
I’ve also completed a Solidworks modification of this file that removes the corner “bumpers” as I described. It’s more of a kludge than I could have accomplished with the original design file, but hopefully it will be easier on my pockets. I’ve ordered one, but don’t want to post the file until I know it prints something useable.