This is a low filament reloading tray for 308, and 30 06. It used only around 100 grams of filament about and will hold 100. They also "interlock" as in push close together, but there is no real lock. Seems nice for storage, but is close quarters for reloading, but can work.
I uploaded hex test so you test it out, or scale it to make sure it will work before printing, and you can play with it for other calibers.
I've printed 6 of these in pla pro from esun and they work great.
I printed this at .3 resolution. My printer did fine at 60 mm/s in cura. Use your best judgement. Can be hard to get off build plate, so make sure you have that dialed in.
This was done in Fusion360.