This is an OpenSCAD file allowing to create STL for battery cases (with or without a sheath) in a parametric way, by selecting : 

• the number of rows and columns you want for cells (1x10 = 10 cells, 2x15 = 30 cells, …)
• the exact type of batteries you want to store (through their dimensions)
• some extra parameters regarding what you want to render (only the rack for the cells and/or the sheath, with or without label, and so on)
• adjust, if needed, some dimensions

A few pre-generated STL are provided : 

• CR2032 : 1x15
• CR2025 : 1x15
• CR2450 : 1x10
• LR44 : 2x8 

But you can easily generate some other combinations by yourselves.

One important advice - as said by the author of the v1 / v2 of this file (and this is a good advice that should be followed !) : 

I recommend a trial run using OpenSCAD -- a free download -- to specify only one battery row.  In other words make the trial rack and case very short.  Test the fit with the battery or batteries in the rack.  If the fit is bad, adjust the case either through OpenSCAD or your slicer. 

Other recommandations : 

• it makes sense to print the sheath with transparent filament (see some of the photos on the original model)
• if you print “rack” and “sheath" on the same plate, it's probably adviced to print with as sequence “per objects” and not “per layers”. Here is a timelapse of the CR2450 case printed on my Bambu Lab X1C : 

Regarding prints : on my side, i printed several cases on a Bambu Lab X1C, with Textured PEI plate and PETG (with default Bambu Studio settings) : 

• 0 issues (obviously) regarding the prints
• 0 issues on my side with the printed battery cases : everything fits perfectly with these values, and the racks are 100% staying well in place when loaded with some batteries, still without any difficulties to put them in place (no need to “force” anywhere). But, of course, your mileage may vary (depending on your settings, filaments, …), hence the need to do a small test with a “1x3” model. 

History : 

• New in v2, per the author of that version : I added an optional bump near the back of the sheath so that the rack gets pinched and therefore does not slide out if tipped.  The bump size is adjustable via the OpenSCAD source.  There must be a battery in place for pinching to occur.
• New in v3.0 : 
  • Label on the sheath
  • No more “holes” at the bottom of the rack (extra height added)
  • Variables to have an easier way about enabling / disabling what need to be rendered
  • Rails on the sides of the sheath for the rack to be better kept in plaec
  • Correction of one bug regarding multi-columns sheath (the width was wrong in v2 : “thickness” was counted too many times, whereas there are overlaps)
  • A few extra examples of other battery cases
  • Extra comments in the source code for clarity / ease of modification in the future