UPDATE 2025-12-28: New version with new features, thanks to comments by @armaguedes.  The original bins are still available in the Version 1 folder.  The purple bins in the photos are V2; the orange ones are V1.

• A new 3×1 bin holds medium breadboards more securely.

• indents for the interlock tabs at the bottom of the large bin

• bigger indents for the interlock tabs at the bottoms of the medium bins

• crush ribs for the magnet holes

• slightly more accurate dimensions all around

• better fillets and chamfers

Here are Gridfinity compatible bins for three different sizes of electronics breadboard.  Each bin holds three breadboards on edge.

They are stackable (when empty) and have magnet and screw holes.

I modeled these in Fusion 360.  I've included the CAD files in .f3d and .STEP formats.

How to Print

It doesn't matter.  Material, layer height, perimeters, infill, whatever.  I'd avoid nozzles bigger than 0.6mm -- some of the walls are pretty thin.

If you use magnets, do superglue them in place.  The crush ribs will hold them securely while gluing, but plastic (especially PLA) will creep and the magnets will fall out in a few months.