A tray for a complete cutting die set according to DIN 22568 dies and DIN 225 / 25 x 9 mm die holder plus slots for die guides.
There are various sets from different vendors like this one by Exact (affiliate Link) that fit in this tray. The die guides can be also found on amazon or 3d printed from my model.
The tray is 3x4x3U and stackable.
Your favourite gridfinity settings, flat on the build plate, no supports needed.