How to restore and upgrade the Anycubic Kobra 2 Neo with Klipper

Resurrecting a neglected 3D printer requires more than just basic troubleshooting. After identifying missing components in the initial repair phase, this project focuses on finalizing the hotend cooling, upgrading the electronics, and migrating the Anycubic Kobra 2 Neo to the Klipper firmware ecosystem. By integrating a Raspberry Pi 3B and optimizing the cooling architecture, the printer is transformed from a broken unit into a capable, high-performance machine ready for advanced printing tasks.

Step-by-Step Assembly, Repair, Testing & Inspection

Assessing the Broken Kobra 2 Neo

The initial assessment revealed a printer that was essentially a shell. Several critical components were missing from the factory assembly. Fixing the primary mechanical failure was just the starting point. Now, the goal is to complete the hardware restoration. It's a major project. Getting this machine back to a functional state requires a systematic approach to electronics and cooling.

Installing the 3010 Hotend Cooling Fan

The hotend was missing its essential 3010 cooling fan. Without this fan, heat from the nozzle travels up the heatbreak. This causes premature melting of the filament. It leads to persistent clogs and jams. Installing this fan is mandatory for reliable operation. The cooling loop is finally complete.

Upgrading Stepper Driver Cooling

Stepper drivers generate significant heat during high-speed movements. I noticed the original board lacked heatsinks on these drivers. Adding them is a simple thermal insurance policy. It prevents thermal throttling during long prints. The drivers run much cooler now. This is a solid upgrade.

Replacing the Part Cooling Fan

While working on the toolhead, I accidentally snapped the original 5020 fan. It was a frustrating mistake. Instead of sourcing an identical replacement, I opted for a 5015 blower fan. This required printing a custom fan duct to ensure proper airflow direction. The new setup provides better part cooling. It's a significant improvement over the stock configuration.

Configuring the LM2596 Buck Converter

The Kobra 2 Neo runs on a 24V power supply. However, the new 3010 and 5015 fans are rated for 12V operation. Connecting them directly would fry the electronics. I installed an LM2596 buck converter to step the voltage down safely. Setting the output to exactly 12V is critical. The fans now run at their intended speed.

Preparing the Raspberry Pi 3B Host

The printer was still running the stock Marlin firmware. I wanted to move to Klipper for better control and performance. A spare Raspberry Pi 3B was repurposed for this task. It was previously used for Pi-hole but sat idle. Now it serves as the Klipper host. Setup is straightforward.

Installing MainsailOS and Firmware

MainsailOS was flashed onto a microSD card for the Pi. This handles the web interface and Klipper software. The printer's motherboard uses a GD32F303 microcontroller. Klipper supports this chip natively. I built the firmware with the correct parameters. The system is ready to communicate.

Configuring printer.cfg in Mainsail

Configuring the printer.cfg file involved some trial and error. Getting the endstops and motor directions right is tricky. Fortunately, the Klipper community provided a reference configuration for the Kobra 2 Neo. Using that as a base saved hours of work. The configuration is now stable.

Testing Movement and Sensors

Before printing, I verified every axis individually. The motors moved in the correct directions. Next, I checked the endstops and heater sensors. Everything responded as expected. Finally, I homed the printer. It worked perfectly.

Validating Klipper Performance

Seeing the printer respond in Klipper was a huge relief. I had previously printed a Cali cat with the stock firmware, so I knew the mechanics were sound. Now, with the upgraded cooling and Klipper, the machine is much more capable. It's a big difference.

First Layer and System Verification

The first layer went down clean and consistent. This confirmed the repairs and upgrades were successful. The printer is officially back in action. It's a satisfying result. The project was supposed to be simple, but it evolved into something much more substantial.

Planning Future Upgrades

The restoration is complete, but the project isn't over. I have a bamboo-style hotend and a Sherpa mini extruder ready for installation. Major electronics upgrades are also on the horizon. The printer is now a platform for further experimentation. Stay tuned for part three.

Summary & Tips

The Anycubic Kobra 2 Neo is now fully operational and running Klipper firmware. This restoration successfully addressed missing cooling components and outdated electronics. The printer is now a reliable tool for future fabrication projects. It's ready for the next phase of advanced modifications.

Disclaimer: I purchased all tools for this guide with my own money to ensure an unbiased review. This post contains affiliate links, meaning I earn a small commission if you make a purchase at no extra cost to you.