GQ BQ H2 Smart Direct Extruder Instruction Manual

: June 8, 2024
: BIQU

GQ BQ H2 Smart Direct Extruder Instruction Manual

Features

Built-in smart filament sensor detects filament break (low electric level when no filament), filament block ( detection accuracy 2.88mm) and other information, output corresponding signals
Extrusion: Double gear extrusion
Maximum print temperature: 260°c ( up to soo0C)
Weight: 198g (including heat block, nozzle)
Maximum extrusion: 7.5kg (decided by filament)
Diameter and tolerance of filament: 1.75±0.osmm
Extrusion volume: 6oommA3/min (depending on filament)
Pulse: 932/mm at 16 micro step(need to be confirmed)
Current of the motor: 8oomA
Gear ratio: 7: 1
Circumference of extrusion wheel: 24.5mm
Extrusion gear diameter: 7.8mm

Based on the designated size, but not compatible with Nemal4 size

Overall size: 75.8x38x77.2mm
Diameter of nozzle: 0.4mm

GQ BQ H2 Smart Direct Extruder Instruction Manual - Product
Overview

More guidance

It is recommended to keep the fan facing left when installing. Make sure the gear and outlet are on the right if the fan facing right. The eight M3 screw holes are available for fixing the extruder.
The supplied M3*8 screws are suitable for mounting plate (3-smm).
Recommended slicing parameter: retraction length 1mm, retraction speed: 15mm/s.

Firmware configuration

Recommended pulse: 932/mm at 16 micro step for extruder.
The break pin electric level is low when there is no filament. The IO pin needs to be set as “Pull-up input”. Once the filament moves 2.88mm, the block pin level will change. And the IO pin needs to be set as “Pull-up input”.
H2 smart is a direct drive extruder, DO NOT add retraction moves when filament outage is detected, otherwise the heated and softened filament will get
retracted onto the drive gear and cause the gear to jam.
When filament runout is detected, it is recommended to add an extrusion move of 11mm to removed the remaining filament in the filament path, after which new filament can be inserted.

Configuration of filament break and block detection

Marlin
a)Uncomment #define FIIAMENT_RUNOUT_SENSOR

GQ BQ H2 Smart Direct Extruder Instruction Manual - Configuration of
filament break and block detection

b) Uncomment #define FILAMENT_RUNOUT_DISTANCE_MM 3, set the
detection accuracy as 3mm (the actual value of Hz-&nm is 2.88mm)
c) Uncomment #defineFILAMENT_MaTION_SENSOR
d) Uncomment

define NOZZLE_PARK_FEATURE

define ADVANCED PAUSE_FEATURE

Set the pause position according to actual situation, and set the retraction length as 0mm to avoid the heated and softened filament be retracted onto the extruder s gear.
e) It is able to work with our serial touch screen, please refer to the following link https://github.com/bigtreetech!BIGTREETECH- TouchScreenFirmware#
marlin-dependencies
2) Rep Rap Firmware
Add M591 Do P7 C “eostop” !2.88 R75: 125 E9 S1 to config.g configuration file and modify the name of eostop according to the actual wiring on the motherboard.
3)Kipper [filament_motion_sensorencoder_sensor] detection_length: 3

The minimum length of filament pulled through the sensor to trigger

a state change on the switch_pin

Default is 7 mm extruder: extruder

The name of the extruder section this sensor is associated with.

This parameter must be provided. switch_pin: PA9

changing the switch_pin name according to your motherboard

pause_on_runout True

runout_gaxle:

insert_gaxle:

event_delay:

pause_delay:

Wiring

The cable of the Smart Filament Sensor consists of a 4p terminal divided into two 3p terminals. The 4p terminal end is plugged into the Smart Filament Sensor.

GQ BQ H2 Smart Direct Extruder Instruction Manual -
Wiring