This is a holder for the full portafilter handle. I would recommend using PETG or ABS so that it can be used when portafilter is still warm. If you plan to only store portafilters in here, it wouldn't matter. This is the smaller basket ring opening model, that fits most portafilters - this one is 70mm (measure just under the "wings" of your specific portafilter).

This is the Gridfinity version of my espresso organizer. I call this version of Gridfinity "Underengineered" as I have removed the stacking crown and the corner radii. This makes for a cleaner and nearly seamless top look if all of the bins are the same height.

This was originally a tabletop organizer that aligned with an alternating magnetic pattern. I thought that these would work well with gridfinity, as the dimensions were already almost the same at 40mm increments, so I adapted it. If there is interest, I will also clean up and release those desktop files.

Images will be updated when I can.