I have some Packout deep & slim organizers which I found could use some extra attention for added versatility. The slim organizers only come with a simple straight divider. So, I designed and made an X grid divider ( https://www.thingiverse.com/thing:3520576 ) and a T divider in Tinkercad.
Fits more snugly into the bin than the factory pieces, and printed in red, it looks quite sharp.
I have been printing them with a brim, which does take a tiny bit of cleanup, and print them in about an hour.
Update 3/28: It seems in combination with the brim, that the center dimple spacing is a bit small and hard to clean, and may cause it to sit a touch high. Adjusted with a slightly larger dimple.