Mellow K-Type Thermocouple Stick Board SPI for 3D Printers
Mellow K-Type Thermocouple Stick Board SPI for 3D Printers
Mellow FLY K-Type Thermocouple Stick Board with SPI Interface
Upgrade your DIY 3D printer's temperature monitoring with the Mellow FLY K-Type Thermocouple Stick Board. Engineered specifically for high-temperature FDM printing applications, this compact add-on board brings precision and simplicity to your build — no complicated wiring, no guesswork.
Dual MAX6675 Chips for Accurate High-Temp Sensing
The board features two onboard MAX6675 chips, each capable of connecting a K-type thermocouple via the mainboard's motor ports. This lets you monitor temperatures up to and beyond 500°C — the ideal solution for high-performance hotends and exotic filament materials that push standard thermistors to their limits.
Plug-and-Play After the Driver Port
Installation is effortless. The Stick Board plugs directly into the driver port slot on your 3D printer motherboard, enabling two K-type thermocouples to be connected through the motor ports immediately. No soldering, no adapter boards needed.
Seamless Klipper Firmware Compatibility
This module is designed to work out-of-the-box with Klipper firmware. Simply connect, configure your printer.cfg, and you're ready to print. Ideal for Voron, RatRig, and other Klipper-powered custom 3D printer builds.
Why K-Type Thermocouples?
K-type thermocouples are the industry-standard choice for extreme-temperature environments. Widely used in industrial settings, they deliver superior stability and accuracy at temperatures where standard NTC thermistors become unreliable — making them the go-to sensor for high-temp hotends like the Revo High Flow, Dragon UHF, and similar.
Key Features
- ✅ Dual MAX6675 thermocouple-to-digital converter chips
- ✅ SPI interface for reliable, noise-resistant communication
- ✅ Supports temperatures up to 500°C and beyond
- ✅ Plug-and-play into standard driver port slots
- ✅ Klipper firmware compatible — no additional configuration hassle
- ✅ Compact stick board form factor — fits most 3D printer motherboards
- ✅ No assembly required — ready to use out of the box
- ✅ Made in Mainland China
Specifications
| Brand | Mellow |
| Model Number | 20KTYPESB |
| Interface | SPI |
| Onboard Chips | 2× MAX6675 |
| Max Temperature | 500°C+ |
| Firmware Compatibility | Klipper |
| Assembly Required | No |
| Origin | Mainland China |
⚠️ Important Note
K-type thermocouples must be connected with the correct polarity. Reversed polarity will result in incorrect readings. Always verify the positive (+) and negative (−) leads before powering on your printer.
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Frequently Asked Questions
Q: What is the Mellow FLY K-Type Thermocouple Stick Board used for in 3D printing?
A: The Mellow FLY K-Type Thermocouple Stick Board is used to add K-type thermocouple temperature sensing to a 3D printer motherboard via SPI. It plugs into the driver port slot and supports two K-type thermocouples simultaneously using its dual MAX6675 chips, enabling accurate high-temperature measurement up to 500°C and beyond — ideal for high-performance hotends and specialty filaments.
Q: Is this thermocouple board compatible with Klipper firmware?
A: Yes, the Mellow FLY K-Type Thermocouple Stick Board is fully compatible with Klipper firmware. You simply connect the board, update your printer.cfg with the appropriate MAX6675 sensor configuration, and it is ready to use. No additional firmware patching or complex setup is required.
Q: Do I need to worry about polarity when connecting my K-type thermocouples?
A: Yes — K-type thermocouples are polarity-sensitive. You must connect the positive (+) and negative (−) leads to their correct terminals. Reversed polarity will cause inaccurate or inverted temperature readings, which can affect print quality or trigger safety shutdowns. Always double-check your thermocouple wiring before powering on your printer.
Q: Which 3D printer builds is this board best suited for?
A: This board is best suited for DIY and custom 3D printer builds that use Klipper firmware and require high-temperature hotend sensing — such as Voron, RatRig, or any open-frame build running high-temp all-metal hotends. It is particularly valuable when printing with engineering-grade filaments like high-temp Nylon, Polycarbonate, or PEEK that require hotend temperatures exceeding standard thermistor ranges.
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.