Costco Friendly battery Tray - AA and AAA Kirkland by WashingtonApple on Thingiverse: https://www.thingiverse.com/thing:6422705

Summary:
Battery tray for 48 each of AA and AAA batteries. That's the amount you will get if you buy a pack of each of Kirkland brand batteries at Costco. One version is plain and one version has the Kirkland Signature logo on both of the long sides. There is also one tray for 48 AA and one tray for 48 AAA for smaller printers or folks who don't use one or the other types of batteries.