Useful Macros — K2 Plus

The helper script installs a set of commonly used macros adapted for the K2 Plus hardware. These replace the K1 Series macro set and account for the K2 Plus's dual-Z, actively heated chamber, CoreXY kinematics, and CFS.

K1 macros are not compatible

Do not copy K1 Series macros to the K2 Plus. Fan pin names, chamber references, and bed dimensions all differ.

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Installation

Make sure you have followed the Install Helper Script section, then from the [Install] Menu install Useful Macros.

Macros are written to /mnt/UDISK/printer_data/config/useful_macros.cfg and included from printer.cfg.

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START_PRINT

The installed START_PRINT macro accepts the following parameters from your slicer:

Parameter	Default	Description
BED_TEMP	60	Bed target temperature
EXTRUDER_TEMP	200	Extruder target temperature
CHAMBER_TEMP	0	Chamber target (0 = no chamber pre-heat)
FILAMENT_TYPE	PLA	Used to set sensible defaults

What it does

1. Homes all axes (G28)
2. Performs Z-tilt adjustment (Z_TILT_ADJUST) — K2 Plus has dual Z motors
3. If CHAMBER_TEMP > 0: starts chamber heater and waits for temperature
4. Waits for bed temperature (M190)
5. Heats nozzle to 80% to avoid ooze during leveling (M109 S{temp * 0.8})
6. Runs KAMP adaptive bed mesh (BED_MESH_CALIBRATE) if enabled
7. Heats nozzle to full temperature (M109)
8. Runs purge line (LINE_PURGE) at print boundary
9. Starts print

Slicer start G-code

In OrcaSlicer (or any Klipper-aware slicer), set your machine start G-code to:

START_PRINT BED_TEMP=[bed_temperature_initial_layer_single] EXTRUDER_TEMP=[nozzle_temperature_initial_layer] CHAMBER_TEMP=[chamber_temperature]

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END_PRINT

END_PRINT

What it does:

1. Turns off heaters (M104 S0, M140 S0, SET_HEATER_TEMPERATURE HEATER=chamber_heater TARGET=0)
2. Moves toolhead to safe park position
3. Disables steppers (except Z — holds position to prevent Z drop)
4. Turns off fans
5. Presents the part (moves bed forward)

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PAUSE / RESUME / CANCEL_PRINT

The helper script installs improved versions of these macros that:

• Park the toolhead at a configurable safe position on pause
• Save and restore extruder position on resume
• Handle CFS state correctly if a tool change was in progress

PAUSE
RESUME
CANCEL_PRINT

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WARMUP

Pre-heats the printer to a target without starting a print. Useful for letting the chamber stabilize before a critical print.

WARMUP BED=100 EXTRUDER=200 CHAMBER=45 DURATION=600

Parameter	Description
BED	Bed target temperature
EXTRUDER	Extruder target (holds at temp for duration)
CHAMBER	Chamber heater target
DURATION	Soak time in seconds after all temps reached

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Z_TILT_ADJUST Note

The K2 Plus has two independent Z stepper motors (stepper_z and stepper_z1) and requires Z_TILT_ADJUST before every print to level the gantry. This is called automatically by START_PRINT. The probe points are:

[z_tilt]
points:
    5,175
    345,175

Do not remove the Z_TILT_ADJUST call from START_PRINT — without it, gantry tilt accumulates over time and causes first-layer inconsistency.

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RELOAD_CAMERA

Restarts the WebRTC camera service without rebooting the printer:

RELOAD_CAMERA

This calls /etc/init.d/S97webrtc restart via a gcode shell command. Useful when the camera feed drops without a hardware fault.

Requires Klipper Gcode Shell Command

RELOAD_CAMERA requires the Klipper Gcode Shell Command feature to be installed.