A practical collection of documented hardware and firmware modifications for the Creality Ender 3 V2. The repository focuses on upgrades that were implemented on real hardware and preserves the wiring, configuration, schematics, photographs, and demonstrations required to reproduce them.
The guide currently documents three upgrade areas:
| Upgrade | Purpose | Documentation |
|---|---|---|
| BFPTouch Sensor | Add low-cost automatic bed probing using an SG90 servo and optical endstop | Hardware installation, wiring, firmware approach, photos and demonstrations |
| Case Light | Add firmware-controlled 24 V case lighting to the Ender 3 V2 mainboard | Mainboard modification, schematic, Marlin configuration and assembly photos |
| Filament Sensor | Add filament-presence detection | Installation photos and demonstration assets |
The repository is organized as a set of independent modifications. Each documented upgrade can be reviewed separately without requiring the others.
| Area | Implementation |
|---|---|
| Target printer | Creality Ender 3 V2 |
| Firmware | Marlin |
| Automatic bed probing | BFPTouch / BLTouch-style functionality |
| Probe hardware | SG90 servo + optical endstop |
| Case-light control | MCU PA3 → HC245 → MOSFET |
| Case-light supply | 24 V |
| Case-light command | Marlin M355 |
| Brightness range | 0–255 |
| Documentation | English and Turkish |
| Supporting material | Schematics, wiring information, photos and GIF demonstrations |
Open the BFPTouch installation guide →
The BFPTouch modification provides BLTouch-style probing using a 3D-printed mount, an SG90 servo motor, and an optical endstop. Because the BFPTouch does not contain the controller used by a BLTouch, the servo signal directly controls the mechanical angle and requires compatible firmware configuration.
The existing guide includes:
- component and mounting requirements;
- Ender 3 V2 mainboard wiring;
- explanation of the BFPTouch/BLTouch control difference;
- pre-configured firmware and manual Marlin configuration paths;
- installation photographs and animated demonstrations.
Open the case-light modification guide →
The Ender 3 V2 mainboard does not provide a dedicated case-light output, although Marlin supports case-light control. This modification repurposes the PA3 MCU pin and uses an unused HC245 channel together with an external N-channel MOSFET to switch a 24 V LED load.
The documented signal path is:
MCU PA3
│
▼
RP6 resistor network
│
▼
Unused HC245 channel
│
▼
10 Ω series resistor
│
▼
N-channel MOSFET
│
▼
24 V case light
The guide includes the mainboard modification schematic, component selection, soldering references, assembly photographs, and the required Marlin settings.
Case-light control is exposed through Marlin's M355 command:
M355 [P<byte>] [S<bool>]
P<byte>: brightness from 0 to 255S<bool>: light on/off state
The firmware configuration also documents menu control, optional fast PWM at 31.4 kHz, startup state, and default brightness.
Open the filament-sensor directory →
The filament-sensor section documents the evidence currently available in the repository: installation photographs and an animated demonstration. The sub-guide deliberately limits itself to those verified materials; wiring and firmware details are not inferred where the repository does not provide them.
The material in this repository is based on implemented modifications rather than a generic list of possible Ender 3 V2 upgrades. The documentation separates the work into four layers where material is available:
Hardware modification
↓
Electrical / wiring reference
↓
Firmware configuration
↓
Physical installation and verification
This makes it possible to inspect both the implementation and the reasoning behind the modification instead of relying only on a finished firmware binary.
The BFPTouch and case-light guides provide two firmware paths:
- use the referenced pre-configured firmware;
- apply the documented changes manually to Marlin and build the firmware.
The pre-configured firmware referenced by the guides is maintained separately in the sezgynus/Ender3V2S1 repository. Manual configuration is documented inside the relevant upgrade guide so that the hardware modifications are not tied exclusively to a pre-built binary.
Ender3-V2-Upgrade-Guide/
├── BFPTouch_Sensor/
│ ├── Photos/
│ ├── README.md
│ └── README-tr.md
├── Case_Light/
│ ├── Diagrams/
│ ├── HW_Modifications/
│ ├── Photos/
│ ├── README.md
│ └── README-tr.md
├── Filament_Sensor/
│ ├── Photos/
│ ├── README.md
│ └── README-tr.md
├── LICENSE
├── README.md
└── README-tr.md
| Area | Status |
|---|---|
| BFPTouch hardware installation | Documented |
| BFPTouch wiring | Documented |
| BFPTouch firmware approach | Documented |
| Case-light hardware modification | Documented |
| Case-light Marlin configuration | Documented |
| Case-light assembly references | Documented |
| Filament-sensor media | Available |
| Filament-sensor media guide | Documented from available repository material |
No undocumented technical details have been inferred in this overview; the status reflects the material currently stored in the repository.
The case-light modification requires soldering directly to the printer mainboard and switches a 24 V load. Disconnect the printer from power before modifying the board, verify the schematic and wiring before power-up, and ensure that the selected MOSFET and LED hardware are suitable for the electrical conditions described in the guide.
This project is licensed under the MIT License.