frame for hexagonal Ice cube tray

I bought some of these hexagonal Ice cube trays and found out they are way too soft to be easily filled in with water without spilling half of it on the way to the freezer. 

So instead of returning them I decided to make a little frame that allows them to be easily filled and allows them to be stacked as well. If you have them as well I would really recommend trying these.

Here is link for one if you want some yourself but you can find same ones everywhere

https://s.click.aliexpress.com/e/_c4bEWA3B