AFC-PRO 8 Lane Box Turtle Multi Filament Controller PCB

AFC-Pro PCB — 8-Channel Control Board for Armored Turtle Box Turtle AMC System

The AFC-Pro is a full-featured control board designed specifically for the Armored Turtle Box Turtle automated filament changer system. Created by Isik's Tech, it consolidates stepper control, brushed DC motor drivers, RGB lighting, thermistors, fans, heater control, and CAN/USB connectivity into a single STM32H723-powered PCB — eliminating the patchwork of separate boards and wiring that Box Turtle builds typically require.

Key Features

• 8× Stepstick slots — TMC2209-based stepsticks for precise stepper motor control (stepsticks not included)
• 8× Brushed DC motor drivers — supports 5V, 12V, and 24V motors for gate and selector mechanisms
• 4× ARGB LED connectors — per-unit status lighting for the full Box Turtle system
• 20× switch connectors — filament presence, gate endstops, and selector switches all handled natively
• 2× thermistor connectors — temperature monitoring for buffer and chamber
• I2C connector — for chamber sensors including Nevermore sensors
• Fan connector — selectable voltage and speed control
• Heater control — onboard support for enclosure or buffer heating
• STM32H723 MCU — high-performance microcontroller with plenty of headroom for complex AFC configurations
• USB and CAN support — plus a spare CAN connector for daisy chaining additional boards
• 5V and 12V buck converters — onboard power regulation, no external converters needed

Specifications

Who Is This For?

The AFC-Pro is built for Voron and other Klipper-based printer builders running the Box Turtle automated filament changer. If you're building a Box Turtle system and want a single, purpose-built board that handles every electrical function of the system — instead of wiring together multiple generic boards — the AFC-Pro is the clean solution. It's especially well suited for 4-unit and 8-unit Box Turtle configurations where the wiring complexity of a DIY approach becomes a real problem.

Documentation & Source Files

• AFC-Pro GitHub Repository — Isik's Tech
• Box Turtle GitHub Repository — Armored Turtle

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