E46 battery tie down

I made this because I didn't want to spend $50 on a tie down from ebay. It broke after a year or so, I don't remember how much infill it had but probably at least 50%. It broke at the bolt holes, so if you use wide washers it'll probably last longer.

Here's the source file, if you create an account I think you should be able to copy and edit it:
https://cad.onshape.com/documents/eeb2aae6d7832ea28d328cf9/w/2b65660b4fe03b42dda4a214/e/1781a6f7956890f061caa7d3

The pics are a previous version with less of a hump on the bottom, I don't have the new version printed and sold my e46.