Simple ammo trays. 50 round or 25 round. All stack together. You can stack 1 or 2 25 round trays on top of the 50 round tray. They are a bit over sized for .40 so they may work for .45 as well. I do not have a .45 round to test it though. These are not what you are going to take to the range. These were designed to print fast and clean up a bunch of loose rounds I had in my safe. If you are looking for sturdier range trays, these are not it. If you want light duty trays that print quickly for not a lot of filament, these are your boys.
I had to turn off thin wall detection in slic3rPe to get them to print correctly. These were printed with some cheap Tianse filament I had I wanted to get rid of.