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v1.0AktivFinales Release-PaketKlipper

Build starten Printables-Release Community-Builds Discord

4 GatesDokumentiertes Gate-Setup

Type-AServo-Selector-Architektur

EBB42Referenz-Verdrahtungsboard

Happy HareKlipper-MMU-Software

EBB42 wiring overview

The MMX reference build uses the BTT EBB42 as its main control board. The diagram below shows the full pinout as documented in the MMX wiring guide. If your board differs, use your actual pins and update Happy Hare aliases accordingly.

Full MMX EBB42 wiring diagram with all connections labelled — gate sensors, stepper, servo, LEDs and toolhead sensor — MMX full wiring diagram — EBB42 pinout with pre-gate sensors, gear stepper, selector servo, NeoPixels and toolhead sensor.

Adding a Step-Down Converter

Use a step-down converter to power the MMX 5V rail and servo from the printer's 24V supply. Connect 24V+ to IN+ and GND to IN-, then adjust the converter output to approximately 5.1V before connecting it to the MMX.

MMX wiring diagram showing a step-down converter connected from the printer's 24V supply to the regulated 5V MMX and servo rail — Step-down converter wiring for the MMX 5V rail and servo power.

OUT+ supplies the MMX and servo 5V rail.
OUT- connects to MMX GND.
The servo is powered from the regulated 5.1V output.
All grounds - printer PSU, MMX board, controller and step-down converter - must share a common ground.
The remaining MMX wiring stays exactly as shown in the diagram.

⚠ Before connecting the MMX

Never connect 24V directly to the MMX 5V rail or the servo.
Measure the converter output with a multimeter and adjust it to approximately 5.1V.
Double-check polarity before powering the printer.
Perform all wiring with the printer powered off.

Internal components reference

Identify the main hardware inside the MMX enclosure before routing wires. The EBB42 board mounts on the sled; the stepper and servo mount on the rear plate.

BTT EBB42 board and NEMA 17 gear stepper inside the MMX enclosure — Internal components: EBB42 board with NEMA 17 stepper (left) and MG996 servo (right).

MG996 camshaft servo mounted inside the MMX enclosure — Internal components: EBB42 board with NEMA 17 stepper (left) and MG996 servo (right).

Gate switch harness and EBB42 board layout

Each pre-gate sensor connects to the EBB42 via its own switch harness. The board render shows physical connector locations to help route each harness to the correct header.

Gate pre-gate switch harness wired and routed to the EBB42 — Gate switch harness wiring (left) and EBB42 board connector layout reference (right).

EBB42 board render showing all connector positions and headers — Gate switch harness wiring (left) and EBB42 board connector layout reference (right).

EBB42 pinout

Reference pinout from the MMX wiring diagram. If your board or wiring differs, use your actual pins and update Happy Hare aliases accordingly.

Function	Pin	Use
Gate 0 pre-gate switch	PB7	Filament detection
Gate 1 pre-gate switch	PB5	Filament detection
Gate 2 pre-gate switch	PB6	Filament detection
Gate 3 pre-gate switch	PB8	Filament detection
Selector servo	PB9	Selector/camshaft movement
RGB / NeoPixel	PD3	Gate LEDs
Stepper UART	PA15	Gear stepper control
Stepper STEP	PD0	Gear stepper control
Stepper DIR	PD1	Gear stepper control
Stepper ENABLE	PD2	Gear stepper control
Toolhead sensor	PB4	Toolhead filament detection

Power warning

If USB is used as the serial connection, the manual notes that 24V must still be provided through the CAN connector. Always verify your motor wire colors against your specific stepper documentation.