This case holds 5 x LPE6 batteries very securely.
Just a touch of foam to the lid to prevent batteries from hitting the lid.
Included in the print is the TPU o-ring which is good if you want a nice tight seal.
Use 30mm M3 screws for the lid and latches.
Profile is setup for PETG, but you could print PLA as its a very structually solid design. My print profile is set to slow settings to ensure top quality finish, be patient!