This is a case I designed for an LP brand (cheap Chinese) EN-EL14 charger and two batteries that I bought on Amazon. I did this mainly because I was bored and wanted to work on my very limited FreeCAD skills a little bit. It's fairly specific to my own needs, but I'm including the FreeCAD file in case someone wants to modify it to fit a similar charger\battery set. The FreeCAD file includes a spreadsheet with the parameters for all the dimensions, so so if you just need to adjust the sizes, you should be able to just enter the appropriate dimensions in the spreadsheet. It printed quite well in PLA with no supports and about 10% infill.