Parametric 18650 Battery Case with magnetic lid
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Parametric 18650 case and parametric fusion model. This design is two piece and uses magnets and a lip to secure the lid
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# Parametric Battery Case Generator
A fully parametric battery case system designed in Fusion 360. Configurable for multiple cylindrical battery sizes, with optional magnet-fit lids.
## ✅ Features
- Available STLS include a 2x3 configuration and a 1x4 configuration for 18650s with magnet holes for 6mmX2mm magnets. The battery diameter for these stls is 20mm; some wraps tend to be much thicker, it's best to confirm your diameter beforehand as I've found issues with some wraps.
- Supports common cylindrical cells (18650, 21700, LTO, etc.)
- Configurable battery count (rows/columns)
- Optional magnet retention
- Wall thickness, fit tolerance, and edge rounding all user-controlled
- Clean FDM-friendly geometry (no supports required)
## 🛠 How to Customize
Open the included .f3d file in Fusion 360. Modify only the **editable parameters** listed below.
### 🔧 Editable Parameters
| Parameter | Purpose |
|------------------------|--------------------------------------|
| BatteryLength | Battery length in mm |
| BatteryDiameter | Battery diameter in mm |
| BatteryRow | Number of batteries front-to-back |
| BatteryCol | Number of batteries side-to-side |
| WallThickness | Outer and bottom wall thickness |
| MagnetDiameter | Diameter of magnets used (optional) |
| MagnetDepth | Depth of magnet holes |
| lidOffset | Tolerance for lid fit (PETG = 0.5mm) |
| BatteryDepthInBase | % of battery housed in base enclosure|
| BatteryDepthInLid | % of battery enclosed by lid |
| EdgeRounding | Radius of visual edge rounding |
### 🚫 Do Not Modify
These are **formula-driven** parameters. Changing them will break the model.
| Parameter | Reason |
|----------------------|------------------------------------------|
| CaseHeight | Derived from battery/base dimensions |
| CaseLidHeight | Derived from battery/lid dimensions |
| CaseDepth | Auto-calculated from layout and spacing |
| CaseWidth | Same as above |
| MagnetPadOffset | Depends on magnet size, wall, and offset |
## 📦 Included Files
- Fusion 360 source: .f3d
- STL exports for common sizes