Fusion 360 editable file to customize filled-in Gridfinity blank boxes + Step by step instructions
This is a remix of the original bins by Zack Freedman that you can find here: https://bit.ly/ZFGridfinityDividerBins
This is the parametric version of the model with the containers filled-in. You can edit the parameters of the model in Fusion 360 to make any size container, you can also edit the file to make it with or without the magnet holes. There's a step by step explanation on how you can do this in the PDF in the files section.