Bộ chuyển đổi pin AAA sang AA đơn giản (Dùng ốc M3, không cần ốc vít)

🔋 AAA to AA Adapter (M3 Nut, No Glue, Fully Reusable)

A simple, ultra-low-cost AAA to AA battery adapter using a standard M3 nut and a short piece of filament.

No springs, no metal plates, no glue required.

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✨ Features

🔩 No special parts required

Only a standard M3 nut and filament

💰 Ultra low cost (~$0.02–0.03)

♻ Fully reusable & eco-friendly

🖨 Easy to print (no supports)

🔋Reuse AAA batteries in AA devices

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📦 Required Parts

• 3D printed body (~2.5g filament)

• 1 × M3 hex nut (recommended: stainless steel)

• 1 × 1.75mm filament (12~14mm, used as locking pin)

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🔧 Assembly

Insert the M3 nut into the hex slot.

And just insert the filament pin to lock the nut.

No glue. No tools. Fully reversible.

Need the full assembly video? Check below:

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🧩 Versions

1 Standard Version (Easy Print)

• Slightly shorter than AA

• Easier to insert and remove

• Easy to print

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2 Lightweight / Open Version

• Reduced material usage

• Internal structure visible

• Same function, lighter design

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⚙ Design Notes

• M3 nut = length spacer + electrical contact + AA positive terminal

• Filament pin = mechanical locking system

• Hex pocket prevents rotation, pin prevents movement

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⚡ Recommended Use

• Remote controls

• Wireless mouse / keyboard

• Clocks and low-power electronics

⚠ Not intended for high-power devices

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🧪 Material Recommendation

• Recommended: Stainless steel M3 nut

• Easy to source

• Corrosion resistant

• Durable

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💡 Summary

A minimal, robust, and glue-free AAA to AA adapter built from standard parts — optimized for cost, simplicity, and reusability.

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Remixes and improvements are always welcome, and a new version is now in progress—stay tuned!