I remixed the files to hold 3 trays in one case and added screw holes so that i can mount it underneath a shelf. pictures will be added once it finishes printing. if requested i will alter the design to hold more cartridges. right now it holds 9, 3 in each tray.
printet at 0.1 mm, but i dont think it will harm it to be printet in 0.15, 0,2 or more.
i did scale the case to 1.08 to make sure the trays slide nicely, your tolerances may be better than mine, so you might not need it.