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Organizers & storage
21700 battery storage tray for 8 cells with polarity marks
A desktop tray that keeps eight 21700 lithium cells upright and separated, handy for vape, torch, power bank and e-bike battery projects. Each cell is 21.4 mm in diameter and 70.6 mm long, so the tray has eight 22 mm bores 35 mm deep on a 26 mm pitch in two rows, a 1.5 mm finger notch at the front of each bore and raised plus and minus symbols embossed 0.6 mm on the rim so you can track which cells are charged. The base is 4 mm thick with 1.6 mm walls between cells, and a 3 mm chamfer at the bore mouth guides the cell in. Prints flat in one piece with no supports. Open the ready-made model free, resize it on your phone or computer, then download a print-ready STL, 3MF or G-code sliced for your printer, free.Opening the ready-made model and downloading it as STL or 3MF are free, no card; AI changes use credits, from Maker at $7.99 a month.No printer? We print this part and ship it to your door. See its priceUpdated
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Adjust
Change its numbers in the viewer for free, or ask the AI in the chat: wall thickness, hole size, the thing it clips onto. AI changes use 2 credits per request (1 for a quick edit, 3 for a redesign), paid with a plan from Maker at $7.99 a month.3Print
Download a watertight STL or 3MF free, with your numbers and hand edits, or G-code sliced for your printer at the same price. After an AI change the download is included in every plan (4 credits without one).
Dimensions of the ready-made model (editable)
| Parameter | Value |
|---|---|
| bore diameter (0.5mm clearance over 21mm cell) | 22 mm |
| bore depth | 35 mm |
| base thickness | 4 mm |
| pitch between bores | 26 mm |
| outer wall thickness | 3 mm |
| finger notch width | 6 mm |
| finger notch depth (radial cut) | 1.5 mm |
| entry chamfer height | 3 mm |
| size of +/- mark | 6 mm |
| emboss height | 0.6 mm |
Example prompt
Design a battery storage tray for eight 21700 cells with 22 mm bores 35 mm deep on a 26 mm pitch in two rows of four, a 4 mm base, 1.6 mm walls between bores, a 1.5 mm finger notch per bore, a 3 mm entry chamfer and 0.6 mm embossed plus and minus marks on the rim.
Fit notes
A tray sized to the exact cell keeps wraps from being scuffed, which loosely fitting downloads cause. In SpeakCAD you describe your cells, preview the tray in the browser, switch to 18650 or 26650 or add a lid in the chat, and download the STL.
Questions people ask about a 21700 battery storage tray for 8 cells with polarity marks
A desktop tray that keeps eight 21700 lithium cells upright and separated, handy for vape, torch, power bank and e-bike battery projects. Each cell is 21.4 mm in diameter and 70.6 mm long, so the tray has eight 22 mm bores 35 mm deep on a 26 mm pitch in two rows, a 1.5 mm finger notch at the front of each bore and raised plus and minus symbols embossed 0.6 mm on the rim so you can track which cells are charged. The base is 4 mm thick with 1.6 mm walls between cells, and a 3 mm chamfer at the bore mouth guides the cell in. Prints flat in one piece with no supports.
Click Open it free on this page and create a free account (no card): the ready-made model opens in your browser, on your phone or computer, nothing to install. Change its numbers in the viewer for free and download a watertight STL or 3MF free, or G-code sliced for your printer at the same price. An AI change in the chat uses 2 credits per request (3 for a redesign), and the download after it is included in every plan (4 credits without one). Start with Maker: 50 credits a month for $7.99, cancel anytime.
On this page: open the ready-made model free in a SpeakCAD account (no card), change any dimension in the viewer, then download the STL or 3MF free, or G-code sliced for your printer at the same price.
A shared STL is modelled for someone else's measurements. Here you open the ready-made model free, change it to your measurements in the viewer, then download a file sized for the part you actually own, free as STL or 3MF.
Yes. SpeakCAD slices the part on its servers with OrcaSlicer and your printer's official profile (380+ printers, including Bambu Lab, Prusa, Creality and Elegoo), and you download the G-code (a sliced .gcode.3mf for Bambu Lab printers). G-code sliced for your printer costs the same as the STL: included in every plan, free for a part you shaped by hand, 4 credits without a plan for a part with AI work in it. Pick your printer on the printers page to see its profile.
No. SpeakCAD runs in the browser on your phone or computer: the chat, the 3D engine and the live viewer load in the tab. The only file you download is the finished STL, 3MF or sliced G-code.
Print it your way
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