Anycubic Kobra 2 Neo electronics enclosure for BTT SKR mini E3 V3

BTT SKR Mini E3 V3 Enclosure for Anycubic Kobra 2 Neo

This is an alternative electronics enclosure for installing a BTT SKR Mini E3 V3 controller board in the Anycubic Kobra 2 Neo. I designed it after the original mainboard in my printer failed. At the time, replacing it with an SKR Mini E3 V3 was considerably cheaper than sourcing an original board or attempting to repair it.

The enclosure is intended for Marlin firmware and SD card printing. It is not designed for Klipper, as there is no room inside the enclosure for a Raspberry Pi or another single-board computer.

Features

• Designed specifically for the Anycubic Kobra 2 Neo

• Fits the BTT SKR Mini E3 V3 controller board

• Reuses the original cooling fan

• Front access to the microSD card slot and Micro USB port

• Clean cable routing with enough space for wiring

• Prints without supports

• Uses a minimal amount of additional hardware

Required Hardware

• 9 × M3 T-slot nuts

• 9 × M3 × 8 mm screws (mounting enclosure and lid)

• 2 × M3 × 20 mm screws (mounting lid into plastic)

• 9 × M3 × 6 mm screws (mounting the SKR board and fan mount into plastic)

The cooling fan is mounted using the original fan screws from the printer. The fan grill is installed on the inside of the enclosure to prevent wires from contacting the fan blades.

Print Settings

• 4 walls

• 10% cubic infill

• No supports required

The fan mount uses blind holes so it can be printed without supports. During assembly, simply drive the mounting screws through the holes to open them.

Installation

This is not a drop-in replacement.

Installing this enclosure requires removing the original electronics enclosure, rewiring the printer, and configuring Marlin firmware for the SKR Mini E3 V3. You should only attempt this modification if you are comfortable working with printer electronics and compiling firmware.

Notes from My Conversion

These notes may save you some troubleshooting time:

• The original stepper motor wiring results in all steppers rotating in the opposite direction. Reverse the motor direction in firmware.

• The inductive probe signal appears to be level-shifted to safe MCU voltage on the toolhead PCB and can be connected directly to the probe input (PC14). Verify this yourself with a multimeter before connecting it. The signal must never exceed 3.3 V.

• The hotend fans share the same 24 V supply. One fan connector will have two wires, while the other has only one. Double-check the polarity before powering the printer.

• I could not get the original nozzle probing implementation working with standard Marlin.

• The original Anycubic display uses a proprietary interface and should not be connected to the SKR Mini E3 V3, as it may damage the controller board. I used an Ender-compatible display instead.

Disclaimer

This project is provided as-is for experienced users. Working with mains-powered equipment and printer electronics carries a risk of equipment damage or personal injury if performed incorrectly. Verify all wiring before applying power, and perform this modification at your own risk.

If this enclosure helped you bring your Kobra 2 Neo back to life, I'd appreciate seeing your build and hearing about any improvements or remixes!