Battery Storage Tray - Parametric (AA, AAA, C, D, 18650, 21700, CR123A)

Pick a cell size (or type your own diameter and length), the number of columns and rows, and how deep the cells sit. The pocket entries are chamfered and finger grooves make it easy to grab a cell. An engraved label shows the size, and the bottom edge is chamfered to reduce elephant's foot.

Presets: AA 5x4, AAA 6x4, 18650 4x3, C 3x2, D 3x2.

Notes and limits:

This is a storage tray, not a charger or battery case. Store lithium cells (18650, 21700, CR123A) as their maker recommends: away from heat, metal objects and children. Recycle damaged cells.

Cell sizes are generic nominal dimensions; 0.6 mm clearance by default

Previews are OpenSCAD renders, not photos of real prints.

Included files: stl/battery-storage-tray_AA-5x4.stl, stl/battery-storage-tray_AAA-6x4.stl, stl/battery-storage-tray_18650-4x3.stl, stl/battery-storage-tray_C-3x2.stl, stl/battery-storage-tray_D-3x2.stl, battery-storage-tray.scad (OpenSCAD source with a Customizer panel), preview renders.

How to customize: install the free OpenSCAD (openscad.org), open the .scad, choose Window > Customizer, change the values, then press F6 (Render) and Export STL.

Parametric OpenSCAD design by Maker Hollow Studio. The files were checked automatically (watertight, correct size, prints without supports) but have not yet been test-printed. Preview images are OpenSCAD renders.

Print settings

Material: PLA or PETG

0.2 mm layers, 2-3 perimeters, 15% infill

Supports: none

Optional: colour change at the label depth

Parameter guide (Group | Parameter | Default | Range / options | What it does)

Battery | battery | "AA" | AA, AAA, C, D, 18650, 21700, CR123A, custom | Cell size. Pick "custom" to type your own diameter/length

Battery | custom_diameter | 14.5 | 5:0.1:40 | Custom cell diameter (mm)

Battery | custom_length | 50.5 | 10:0.5:80 | Custom cell length (mm)

Battery | clearance | 0.6 | 0.2:0.1:2 | Gap around each cell (mm)

Layout | columns | 5 | 1:1:20 | -

Layout | rows | 4 | 1:1:20 | -

Layout | depth_ratio | 0.45 | 0.2:0.05:0.9 | How deep the cell sits, as a fraction of its length

Layout | divider | 1.6 | 1:0.2:4 | Minimum wall between pockets (mm)

Layout | margin | 3 | 1.6:0.2:10 | Outer wall / margin (mm)

Layout | floor_thickness | 1.6 | 0.8:0.2:4 | Floor thickness (mm)

Extras | finger_grooves | true | - | Finger grooves across each row so cells are easy to pinch out

Extras | label | true | - | Engraved label strip along the front edge

Extras | label_text | "" | - | Label text (blank = cell size name)

Extras | label_size | 6 | 3:0.5:14 | Label text size (mm)

Presets (ready-to-print STLs)

battery-storage-tray_AA-5x4.stl (hero): {"battery": "AA", "columns": 5, "rows": 4} - 88 x 81 x 24 mm

battery-storage-tray_AAA-6x4.stl: {"battery": "AAA", "columns": 6, "rows": 4} - 81 x 65 x 22 mm

battery-storage-tray_18650-4x3.stl: {"battery": "18650", "columns": 4, "rows": 3} - 88 x 77 x 31 mm

battery-storage-tray_C-3x2.stl: {"battery": "C", "columns": 3, "rows": 2} - 90 x 71 x 24 mm

battery-storage-tray_D-3x2.stl: {"battery": "D", "columns": 3, "rows": 2} - 114 x 87 x 29 mm

Licence

Licence: Creative Commons Attribution 4.0 International (CC BY 4.0), https://creativecommons.org/licenses/by/4.0/. You may print, remix, share and sell prints and remixes, including commercially, as long as you give attribution (credit Maker Hollow Studio and link to this design).