Box corners for 3mm wood

I was wanting to make customized organizers for my kitchen utensils drawer, but I couldn't find what I needed in the correct size. I wanted to use 3mm basswood for the project and wanted it to easily be switched out with different lengths of wood so I just did a quick L type bracket that the wood pieces can slide into. I made the “opening” 3.02mm for variances in wood size. The wood can just be inserted into the bracket and can be glued in if there will be a lot of movement of the box. Feel free to make any changes that you need. I printed with a brim to help adhesion and printed with PLA. If you want a stronger piece you can use PETG. The file has 16 corners on the plate.