This rack is specifically designed for the BetterBox - Flip Top Storage Box, and it should work with other BetterBox models too, as they're all the same size. It's perfect if you need to stack up several BetterBoxes.
Just a heads-up, one of the photos shows that the box's hinges stick out a bit, so it doesn't sit completely flush with the front of the rack. I didn't plan for this when designing the rack. But, when I tried pulling out a full box using the latch, it wasn't sturdy enough to make the box budge, so that extra space at the front actually comes in handy for grabbing and pulling out the box. Somehow, it works out well at the end.
For the feet of the rack, you'll need to print two for each rack. It's recommended to use the longer feet for the bottom rack. Here's why: if you use the shorter feet, the whole stack might get tilted forward when you're pulling out one of the top boxes. The longer feet keep everything steady and stop the stack from leaning over.
That's it! Happy printing! If this helps you out, I'd love to hear about it. And if you have any feedback or suggestions, I'm totally open to hearing them. Always great to know how these designs work out for you!