Mellow FLY-Pi V3 Klipper Controller Board for DIY 3D Printers
Mellow FLY-Pi V3 Klipper Controller Board for DIY 3D Printers
Mellow FLY-Pi V3 – Advanced Klipper Controller Board for DIY 3D Printers
Take your DIY 3D printer build to the next level with the Mellow FLY-Pi V3, a powerful single-board controller designed from the ground up for Klipper and RRF firmware. Whether you're building a Voron, VzBot, HevORT, or any other high-performance printer, the FLY-Pi V3 delivers the processing muscle, connectivity, and convenience features you need — all in a Raspberry Pi 4-compatible form factor. Made in Mainland China.
Why Choose the FLY-Pi V3?
- FlyOS-FAST Operating System: A lightweight OS deeply optimized for 3D printing, delivering faster instruction processing, smoother motion planning, and superior print accuracy compared to stock Klipper installs.
- Pre-Installed Software — Ready Out of the Box: Ships with Klipper, Moonraker, and Fluidd (Mainsail optional) pre-installed. Input shaping and resonance compensation plugins (numpy pre-installed) are ready to use with zero extra configuration.
- Raspberry Pi 4 Form Factor: Redesigned to match the Raspberry Pi 4 footprint, making it a seamless drop-in replacement for existing printer builds and enclosures.
- 1GB DDR4 RAM + H618 Quad-Core Cortex Processor: Run multiple applications and resource-heavy plugins without slowdowns. More headroom means more reliable, higher-speed printing.
- Power Outage Recovery: Built-in support for resuming prints after unexpected power interruptions — protecting your long print jobs from wasted time and filament.
- FPC Connection for HDMI & TFT Screens: Direct FPC cable connection to the Fly-HDMI screen (replacing bulky HDMI + USB cables) and a dedicated FPC port for a 3.5-inch TFT capacitive touchscreen — a cost-effective KlipperScreen option.
- Built-in RS232 Chip: Native RS232 communication port for direct tool board connection — no extra expansion boards required.
- EMMC + SDIO Expansion: Supports WiFi and up to 32GB storage via the M2WE module (sold in sets), enabling wireless file transfer and stable, fast system storage.
- Klipper & RRF Firmware Compatible: Full flexibility to run the firmware ecosystem that suits your build.
- Camera Support: Crowsnest camera support included (disabled by default, easy to enable).
Technical Specifications
- Processor: H618 Quad-Core Cortex (high-performance)
- RAM: 1024MB DDR4
- GPU: ARM Mali450
- Storage: MicroSD slot + EMMC+SDIO expansion port
- USB: USB 2.0 × 4
- Display: HDMI × 1, FPC-HDMI × 1, FPC-SPI (3.5" TFT) × 1
- Network: 100M Ethernet + WiFi (via M2WE or M2-2.4G expansion)
- Communication: RS232 port × 1, VCC port × 1
- OS: FlyOS-FAST (Linux-based, Klipper + Moonraker + Fluidd pre-installed)
- Model Number: 20FPIV3
Package Sets — Choose What You Need
- Set 1: FLY-Pi V3 Board × 1
- Set 2: FLY-Pi V3 Board × 1 + M2-2.4G WiFi Board × 1
- Set 3: FLY-Pi V3 Board × 1 + Fly-M2WE Board × 1 (16GB eMMC + 5GHz WiFi)
- Set 4: FLY-Pi V3 Board × 1 + 3.5-inch TFT Capacitive Touchscreen × 1
- Set 5: Fly 7-inch HDMI Screen × 1 + 1M FPC Cable × 1
Fly-M2WE Expansion Highlights
- Integrated 16GB eMMC + 2.4G/5G dual-band WiFi
- eMMC read/write speeds ~2× faster than Class 10 TF cards
- 5GHz WiFi file upload speed ≈ 16MB/s
- Plug-and-play with factory pre-installed Linux + Klipper
- Note: WiFi is not available on M2WE when using the Armbian system.
Explore More Tools for Your Workshop
Need more precision tools for your builds? Check out our 10-Pack 65mm Oscillating Multi-Tool Saw Blades or pick up the 5-Pair Nitrile Work Gloves to keep your workspace safe and efficient. For tidy cable and component management, the Stackable Non-Slip Furniture Risers can help keep your printer station stable.
Learn more: OSHA on eye and face protection
Frequently Asked Questions
Q: Is the Mellow FLY-Pi V3 a direct replacement for Raspberry Pi 4 in Klipper builds?
A: Yes. The FLY-Pi V3 is redesigned to share the same form factor as the Raspberry Pi 4, making it a convenient drop-in replacement. It runs FlyOS-FAST with Klipper, Moonraker, and Fluidd pre-installed, so setup time is minimal compared to building a fresh Pi image from scratch.
Q: What WiFi options are available for the FLY-Pi V3?
A: The FLY-Pi V3 includes an EMMC+SDIO expansion port compatible with two WiFi modules: the M2-2.4G board (2.4GHz, ~6MB/s) and the Fly-M2WE board (dual-band 2.4G/5G, up to ~16MB/s with 16GB eMMC storage). Both are available as set bundles. Note that WiFi via M2WE is not supported under the Armbian system.
Q: Does the FLY-Pi V3 support touchscreen displays?
A: Yes. It features an FPC-SPI port for a 3.5-inch TFT capacitive touchscreen (available in Set 4) and an FPC-HDMI port for the Fly 7-inch HDMI screen, replacing the need for separate HDMI and USB cables. KlipperScreen is pre-installed but disabled by default and can be easily enabled.
Q: What firmware does the FLY-Pi V3 support?
A: The FLY-Pi V3 supports both Klipper (with deeply optimized FlyOS-FAST) and RepRapFirmware (RRF). This dual-firmware compatibility gives makers the flexibility to choose the ecosystem that best fits their printer design and workflow.
Q: Does the FLY-Pi V3 resume printing after a power outage?
A: Yes. The FLY-Pi V3 includes power-outage print-resume functionality, helping you recover long print jobs without starting over after an unexpected interruption.
Production & Packaging Notice
To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.