USB-C 1S LiPo / Li-Ion / 18650 Charger Case
Print Profile(1)
Description
Super easy print, prints in under 2 minutes on the P1S in 2 colours!
NOTE: READ THE DISCLAIMER/SAFETY NOTICE FIRST! (at the bottom of this text).
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This 3D-printable case is designed specifically to safely enclose a cheap USB-C 1S 4.2 V Li-x charger PCB(commonly found on AliExpress), turning it into a durable, reusable charger instead of a loose, exposed board.
I use this charger to power 1S LiPo packs for my Sanwa transmitter but the design is universally applicable to any 1S LiPo or Li-Ion cell (3.7 V nominal / 4.2 V full) including 18650 and such.
Why this case is useful
- Electrical safety – Fully encloses the charger PCB, preventing shorts, ESD damage, or accidental contact with live pads
- Mechanical protection – No more fragile bare boards rattling around your pit box or workbench
- Clear LED visibility – Integrated viewports allow you to see charging and full-charge status at a glance
- Proper cable management – Designed for USB-C input and a standard RC battery connector output
- Professional finish – Turns a €2 charger board into a clean, reliable tool you’ll actually want to use
Battery connection
The battery connects via a standard RC servo connector (also known as JR / Futaba-style 3-pin servo connector, 2.54 mm pitch).
This makes it perfect for RC transmitter packs, receiver packs, and custom 1S battery builds—no proprietary connectors or adapters needed.
Additional Components needed:
- Charger board >
- Wired Female Futaba/JR servo connector >
- Tiny drop of superglue
Assembly
After printing the case, remove the tiny supports for the connector opening. Trim any leftover supports with a hobby knife.
Remove or cut the white wire from the female Futaba/JR connector. Take note of the orientation of the connector, the black negative wire should align with the side of the PCB where also the USB-C connecor is located. Superglue the connector to the bottom of the PCB and solder the wires. Red to B+ and Black to B-.
Place the board-connector assembly inside the bottom half of the charger case.
Push the PCB down into the case. Make sure the wires are not trapped between the edge of the case and the PCB.
Once the PCB is al the way inside the case, it should look like this, Do not yet put the top on the case, test the charger first.
Connect a powered USB-C cable to the charger board. The blue led should light up. Now connect a LiPo or Li-Ion battery to the Futaba/JR connector. If the connected battery is not full, the board will immediately start charging and the red led turns on. The blue led is off.
Disconnect the cables from the charger. You can now put the top on the case. I seured the top with some tiny drops of superglue, but depending on the print settings this may not be required for a solid connection between the top and the bottom of the case.
Now you can start using your super small easy to use but very cheap 1S Li-x charger!
Why you should print this case
- Designed around real RC use, not generic electronics
- Compact, practical, and easy to print
- Works equally well for LiPo and Li-Ion 1S cells
- Ideal for RC drivers, DIY battery builders, and electronics hobbyists
If you use cheap USB-C 1S chargers, this case turns them into something safe, robust, and workshop-ready.
Disclaimer / Safety Notice
This model is provided as-is, without any warranty or guarantee of safety, suitability, or fitness for any purpose.
Use at your own risk.
By downloading, printing, or using this design, you accept full responsibility for any damage, malfunction, injury, fire, or other harm that may occur.
Charging LiPo and Li-Ion batteries involves inherent risk, including overheating, fire, and battery failure. Always use appropriate safety precautions, never leave batteries charging unattended, and ensure correct polarity and compatibility before use.
The designer assumes no liability for any loss, damage, or injury resulting from the use, misuse, modification, or improper printing of this model.
If you are not experienced with battery charging or electronics, do not use this design.
License
You may create derivative works based on this object, provided that all such derivative works are published exclusively on the MakerWorld platform and include proper attribution to the original creator. You may not share, upload, host, distribute, or publish this object—or any derivative work of this object—on any other digital platform, marketplace, or distribution channel. Commercial use of this object and any derivative works is strictly prohibited. This includes, but is not limited to, selling, renting, sublicensing, or using the object in any context in which you receive monetary compensation or other financial benefits.
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