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Adapters & couplers
AA to D cell battery adapter
A hollow shell the size of a D cell that carries a single AA battery, letting you run a lantern, radio or toy on the smaller cells you already have. A D cell is 34.2 mm in diameter and 61.5 mm long; the shell uses those dimensions with a 14.8 mm bore for the AA, a bottom well that positions the negative end flush with the base, and an opening at the top so the AA's positive nub protrudes. A 3 mm side slit makes it easy to pop the AA out. 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 |
|---|---|
| D-cell outer diameter | 34 mm |
| D-cell length | 60 mm |
| AA diameter + clearance | 14.8 mm |
| floor thickness | 1 mm |
| how far AA nub should protrude above top | 1 mm |
| full length flex slit width | 3 mm |
Example prompt
Create an AA to D battery adapter. Outer cylinder 34 mm diameter, 60 mm long. Central bore 14.8 mm with an 8 mm top hole so the AA positive terminal protrudes 1 mm. 1 mm floor with a 6 mm hole for negative contact. 3 mm side slit, full length.
Fit notes
SpeakCAD builds the adapter to your exact cell type, including AAA to AA, 18650 to D or C-size shells, and gets the nub protrusion right so contact is reliable. Preview in the browser and ask for a two-cell version or a thinner wall to save filament.
Questions people ask about an AA to D cell battery adapter
A hollow shell the size of a D cell that carries a single AA battery, letting you run a lantern, radio or toy on the smaller cells you already have. A D cell is 34.2 mm in diameter and 61.5 mm long; the shell uses those dimensions with a 14.8 mm bore for the AA, a bottom well that positions the negative end flush with the base, and an opening at the top so the AA's positive nub protrudes. A 3 mm side slit makes it easy to pop the AA out.
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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