Labelled Gridfinity Bins: AA AAA 18650 21700 SD

Labelled Gridfinity bins for batteries and memory cards: AA, AAA, 18650, 21700, CR2032 coin cells, SD and microSD. Pockets are sized from the published standard dimensions plus clearance.

Sizes used (published nominal standard dimensions):

• IEC 60086-2 battery sizes (summary): AA/LR6 ⌀14.5 × 50.5 mm, AAA/LR03 ⌀10.5 × 44.5 mm, CR2032 ⌀20 × 3.2 mm: https://en.wikipedia.org/wiki/List_of_battery_sizes

• 18650 (⌀18 × 65 mm) and 21700 (⌀21 × 70 mm) cylindrical Li-ion sizes: https://en.wikipedia.org/wiki/List_of_battery_sizes

• SD Association card form factors: SD 24 × 32 × 2.1 mm, microSD 11 × 15 × 1.0 mm: https://www.sdcard.org/developers/sd-standard-overview/

How it works: each bin has the standard 42 mm Gridfinity foot and drops into any Gridfinity baseplate. The bodies are shelled (hollow inside, open-bottom feet), so they use far less filament than solid bins. No baseplate is included.

Estimated print time and filament (Bambu Studio slicer estimate, A1, PLA, 0.2 mm, 15% infill, 3 walls, no supports):

• Battery and card bins (any Gridfinity baseplate): about 8h16m and 300 g PLA in total

⚠ Honest note: the images are renders. Designed from the published dimensions and not print-tested yet (my printer hasn't arrived). Please print the smallest bin (microSD) first to check the fit. 🙏 If you print it, please post a Make and comment on the fit (tight / loose / perfect, and by how many mm). I'll update the files.

• Pocket clearance: round cells +0.6 mm on diameter (protected 18650s with wrap can be up to about 18.5 mm, which still fits). Cards +0.6 mm.

• Shelled (hollow) bodies: 0.85 mm pocket tubes, 1.2 mm outer walls, 1 mm floor, 1.6 mm top deck, hollow (open-bottom) feet with the standard Gridfinity foot profile. Pockets run down to the bin floor: AA/AAA 22 mm deep, 18650/21700 29 mm deep, SD slots 22 mm, CR2032 slots 15 mm (3U bin), microSD slots 8 mm (2U bin), so cards and coins stand proud for easy grip.

• Standard 42 mm Gridfinity base. Fits any Gridfinity baseplate.

• Dimension sources are standards summaries. The IEC/SD Association specs are paywalled or members-only, so the published nominal sizes are used [nominal, not max-tolerance].

Unofficial accessory, not affiliated with or endorsed by the brand owner. Names describe fit only. STL + STEP included. Licence CC BY-NC-ND 4.0. Designed by Southern Cross Shed, Perth, Australia.

Parts per set

Battery and card bins (any Gridfinity baseplate)

• cells_AA_2x2.stl × 1

• cells_AAA_2x2.stl × 1

• cells_18650_2x2.stl × 1

• cells_21700_2x2.stl × 1

• cards_CR2032_2x1.stl × 1

• cards_SD_2x2.stl × 1

• cards_microSD_2x1.stl × 1