These bins hold Refills for Copic Markers.

There are two designs - one has the refills angled (to keep the overall height shorter) and the other is vertical.

I included the STLs for a 2x3 grid Vertical bin, and a 2x4 grid Angled bin. Both have 4x6 holes to hold 24 refils.

I have also included the Fusion 360 files for each model so you can make bins of different sizes.

The bins for the Copic Markers are here: https://thangs.com/designer/lathempack/3d-model/Gridfinity%20Copic%20Marker%20Bin-858497