Ammo Tray for 38 S&W
thingiverse
it measures 210mmX165mmX22mm and holds 100 rounds. I actually made it to fit inside a cigar box (Montecristo Habana No.1) I just picked it up at the cigar shop for about $5 (empty). I'm sure other brands would work just as well. No need for supports, rafts, or brim, but they may be necessary if you do not have an enclosure since it's quite a large print.
Download Model from thingiverse
With this file you will be able to print Ammo Tray for 38 S&W with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Ammo Tray for 38 S&W.