BigTreeTech SKR Mini E3 V1.2
Ultra-quiet 32-bit 3D printer board with 4 integrated TMC2209 UART stepper drivers. STM32F103RCT6 @ 72MHz. Direct drop-in replacement for Ender 3. Supports Marlin and Klipper.
$38.99
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Specifications
Components
STMicroelectronics STM32F103RCT6 32-bit ARM Cortex-M3 microcontroller, 256KB flash, 48KB RAM, running at 72MHz
4x TRINAMIC TMC2209 stepper drivers integrated directly on the PCB with UART mode, StealthChop2, and stallGuard for sensorless homing
MicroSD card slot for firmware updates and standalone print file storage
Bus Interfaces
The BigTreeTech SKR Mini E3 V1.2 is a compact 32-bit control board specifically designed as a direct drop-in replacement for the Creality Ender 3's original 8-bit mainboard. It uses the STM32F103RCT6 ARM Cortex-M3 processor running at 72MHz and features 4 integrated TMC2209 stepper drivers in UART mode for silent operation — no separate driver modules required.
The board supports Creality's Ender 3, Ender 3 Pro, CR-10, and CR-10 Mini printers out of the box. Integrated TMC2209 drivers offer StealthChop2 for near-silent printing, plus stallGuard for sensorless homing. A BLTouch/CR Touch header is included for auto bed leveling.
The SKR Mini E3 V1.2 accepts 12–24V DC input, includes a MicroSD card slot, USB Micro-B for PC communication, and expansion headers for TFT displays. Full schematics, PCB layouts, and pre-configured Marlin firmware builds are available on GitHub. Klipper is also fully supported.
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