The Packout Slim Case has two larger rectangular bins, with slots for two dividers, creating three compartments. This insert has a central dividing line creating 6 compartments. The intersections have been reinforced to help support the free standing ribs better.
04/24 Revised, tweaked layout slightly (the intersections may be off by 0.5, but as I designed it on tinkercad with 1mm grid, it is what it is), tweaked lower corners and angled sides, tested as better fitting and shared as v2.
A more versatile sibling - if you need more bins - was created: the x grid plus 8 way divider [ https://www.thingiverse.com/thing:3585008 ]