I have a Ender 3 Max Neo which is the large volume 300x300 print bed with dual Z axis and BL Touch.
My model has the 4.2.2 board with the GD STM32 chipset on it. I have replaced the stock extruder with the Creality Sprite SE near direct drive extruder.
I have everything working and have been testing print speeds of 150mm/s. I haven’t got input shaping setup yet so depending on the type of print I have found that up to 120mm/s can work pretty well.
Tall thin objects will suffer from ghosting at higher speeds but flatter wider models seem to print well at around 110mm/s.
I couldn’t find a printer CFG for the Max Neo and it’s different enough that there were a few changes to the Ender V2 config that I used as a base. The Sprite SE extruder wasn’t too hard to setup, just used the online rotation distance calculator after doing an extrude measure test.
Printer cfg config here :-
# This file contains pin mappings for the stock 2021 Creality Ender 3
# Neo Max with the 32-bit Creality 4.2.2 board. To use this config, during
# "make menuconfig" select the STM32F103 with a "28KiB bootloader" and
# serial (on USART1 PA10/PA9) communication.
# It should be noted that newer variations of this printer shipping in
# 2022 may have GD32F103 chips installed and not STM32F103. You may
# have to inspect the mainboard to ascertain which one you have. If it
# is the GD32F103 then please select Disable SWD at startup in the
# "make menuconfig" along with the same settings for STM32F103.
# This configuration is setup with a Creality Sprite SE Extruder direct
# drive unit and the factory BL Touch. The stock display is not supported.
# Flash this firmware by copying "out/klipper.bin" to a SD card and
# turning on the printer with the card inserted. The firmware
# filename must end in ".bin" and must not match the last filename
# that was flashed. Disconnect the screen before flashing.
# See docs/Config_Reference.md for a description of parameters.
[include mainsail.cfg]
[stepper_x]
step_pin: PC2
dir_pin: PB9
enable_pin: !PC3
microsteps: 16
rotation_distance: 40
endstop_pin: ^PA5
position_endstop: -20
position_min: -20
position_max: 310
homing_speed: 50
[stepper_y]
step_pin: PB8
dir_pin: PB7
enable_pin: !PC3
microsteps: 16
rotation_distance: 40
endstop_pin: ^PA6
position_endstop: 0
position_min: 0
position_max: 310
homing_speed: 50
[stepper_z]
step_pin: PB6
dir_pin: !PB5
enable_pin: !PC3
microsteps: 16
rotation_distance: 8
endstop_pin: probe:z_virtual_endstop
#position_endstop: 0.0
position_min: -3
position_max: 300
[extruder]
max_extrude_only_distance: 100.0
step_pin: PB4
dir_pin: PB3
enable_pin: !PC3
microsteps: 16
rotation_distance: 7.531
nozzle_diameter: 0.400
filament_diameter: 1.750
heater_pin: PA1
sensor_type: EPCOS 100K B57560G104F
sensor_pin: PC5
control: pid
# tuned for stock hardware with 200 degree Celsius target
pid_Kp: 21.527
pid_Ki: 1.063
pid_Kd: 108.982
min_temp: 0
max_temp: 250
[heater_bed]
heater_pin: PA2
sensor_type: EPCOS 100K B57560G104F
sensor_pin: PC4
control: pid
# tuned for stock hardware with 50 degree Celsius target
pid_Kp: 54.027
pid_Ki: 0.770
pid_Kd: 948.182
min_temp: 0
max_temp: 130
[fan]
pin: PA0
[mcu]
serial: /dev/serial/by-id/usb-1a86_USB_Serial-if00-port0
restart_method: command
[printer]
kinematics: cartesian
max_velocity: 300
max_accel: 3000
max_z_velocity: 5
max_z_accel: 100
[bltouch]
sensor_pin: ^PB1
control_pin: PB0
x_offset: 0.0
y_offset: 0.0
#z_offset: 0
speed: 20
samples: 1
sample_retract_dist: 8.0
[safe_z_home]
home_xy_position: 150,150
speed: 150
z_hop: 10
z_hop_speed: 10
[bed_mesh]
speed: 120
mesh_min: 70,50 # Need to handle head distance with cr-touch (bl_touch)
mesh_max: 310,290 # Max probe range
probe_count: 7,7
fade_start: 1
fade_end: 10
fade_target: 0
algorithm: bicubic
[bed_screws]
screw1:30, 40
screw1_name:1
screw2: 270, 40
screw2_name:2
screw3: 270, 280
screw3_name:3
screw4: 30, 280
screw4_name:4
[screws_tilt_adjust]
screw1: 70, 50
screw1_name: front left screw
screw2: 310, 50
screw2_name: front right screw
screw3: 310, 290
screw3_name: rear right screw
screw4: 70, 290
screw4_name: rear left screw
horizontal_move_z: 10
speed: 200
screw_thread: CW-M4 # Use CW for Clockwise and CCW for Counter Clockwise
