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OMGEXTRD DM1

       (1.75mm)

  • Direct Drive Extruder 2 modes.

  • Upgrade example model: ENDER 3 & V2 CR10

  • Net weight: 64g(no motor)

  • Double drive 1:3 Gear Ratio

  • E-steps:770 subdivision 16 step angle 0.9°

  • DM1-set kit include 36stepper motor

  • YouTube/Omgextrd

Notice:Direct drive
STL print slicing software (CURA, etc.) Retraction setting:
Suggested value: Speed 27mm/s ,Retraction Distance: 4mm

The adapted driving voltage is changed to: 0.57V. If the voltage is not changed, the motor may be burned for a long time.

E-STEP

If using a 42 stepper motor, the step angle is 1.8°, the motor drive is 16 subdivisions, and the gear ratio is 1:3
E-STEP 363

If ​​using a stepper motor at 36 pitch, the pitch angle is 0.9°, the motor drive is 16 subdivisions, and the gear ratio is 1:3
E-STEP 726

1-spring presses filament pressure
2-and material of soft and hard filament
The e-step value should be tested and adjusted after installation

E-step: calculation method
Use 1/16 subdivision motor,
Stepper motor step angle = 1.8°,
The diameter of the gear is 8.4mm, the stepper
motor needs 16*200=3200 signals ofimpulse to turn 360°,
Filament moving length = gear circumference = 3,d = 3.14*8 = 26.376mm
How much e-step = filament displacement 1mm:
Calculation method: 3200/26.376 = 121 pulse signal.
E-step value is 121

Gear ratio is 1:3 - E-step value needs 3 times, that is 127.39*3=363 (theoretical value)

If you use 0.9° step angle - the electronic step value needs 2 times, that is 363*2=726 (theoretical value)

NOTE:

DM1 has been replaced with a new size large gear, the diameter is 8.4mm, so the E-STEP value needs to be reset to 726.

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大齿轮6.jpg

Package list

  • 1 * OMGV2s extruder

  • 1 * ID:SST36C1080-1636 Stpper NAMA 14  Step angle 0.9° Japan ASPRINA Weight 95g Made in China

  • 1* ID:V2-M6 (steel hot end adapter)  for  Ender 3 V2

  • 1* ID:10M6A (steel hot end adapter)  for Ender 3   Ender 3 pro  ANYCUBIC ANET etc.

  • 1* ID: M12 (steel fixed position nut)

  • 1*ID:302 (steel M6-M10 socket nut)

  • 1*ID:16M3 (Steel motor gear 5mm)

  • 4* M3x6 (steel hexagon socket screw)

  • 3* M3x10 (steel hexagon socket screw)

  • 3* L tool

  • Package G.W. 270g size:15*12*4cm

DM111.jpg
  • A Install the filament Press bearing using a Cross screwdriver

  • B Put in the middle part (see the picture), Insert the Spring and Screw in the fixing nut (M6)

  • C Install the Teflon bowden, Blue bowden clip is used to fix the Teflon tube(4mm) not move.

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  • A Install stepper motor gear,Note the gear direction

  • B Install M3-6 4pcs  screws (don’t tighten frist)

  • C Adjust the position of the stepper motor gear (as shown in the picture)a

DM113.jpg
  • A  Check Drive gear 2 precision mini bearings up and down is installed (pre-installed in factory)

  • B  Adjust the gear gap, Free and relaxed rotation is the standard.Then tighten the M3-6 *4pcs screws fixed with the motor

DM114.jpg
  • A Adapter part ID: v2-M6 is suitable for ENDER 3 V2. Please check step 5

  • B Adapter part ID: 10M6A suitable for ENDER 3 & CR10 etc. Ps: Adaptation part ID10M6A is also compatible with E3D V6 Hotend

D115.jpg

A  Combination installation 10M6A

B  Installation with extruder

C When connecting with the hot end, leave a gap of 0.5-1mm

D  Use a wrench to adjust the positioning nut. Positioning as shown in the picture C

D116.jpg
  • A  Insert and install Teflon tube

  • B  Cut the Teflon tube, the Teflon tube grows out of the throat 0.5-1mm as shown in the picture, the function is to ensure that the Teflon tube does not move, the extruder retracts the filament to keep the Teflon tube and the nozzle without gaps

  • C  Install heating block and nozzle

  • D Install the hot end and printer mounting plate

D117.jpg
D118.jpg
  • A Use a wrench to adjust the positioning nut. Positioning as shown in the picture A

  • B Insert and install Teflon tube, Cut the Teflon tube, the Teflon tube grows out of the throat 0.5-1mm as shown in the picture, the function is to ensure that the Teflon tube does not move, the extruder retracts the filament to keep the Teflon tube and the nozzle without gaps

  • C  Install heating block and nozzle

D119.jpg

Installation Fixing screws and printer mounting plate and shell

D120.jpg
  • A Hold down the big gear and keep it still.

  • B Pulling the filament, Testing Pulling force

  • C Spring pressure is designed to be limited, spring do not need too tight, Only damage the spring. Recommended that the spring tightening screws are flush with the shell.

Note: The surface of the driven wheel is flat, Function is to Press the filament. The power to pull the transmission filament comes from the driving wheel. The surface of the Pressure wheel has teeth-only damage to the filament-and will not have any good effect on the extrusion effect.

After installation. Need to adjust the E-step to 363  .Pls see  E-step

D121.jpg

To complete the installation, you need to modify 2 steps:

1/ E-step-Value

ENDER series  Original value: 93 needs to be modified to 726

2/ Stepper-current-adjustment

36 motor nama14 adjusts the driving voltage to 0.57V.

E-Step = Value is for the filament to move 1mm

1/Subdivision driving     2/Motor step angle     3/Diameter of gear     4/Gear ratio

1/Subdivision driving

  • such as TMC2209  A4988, etc The driver subdivision value can be modified,

  • The motherboard (master) modification method is different, please consult the motherboard supplier

  • Commonly used are 1/16 1/32 1/64 etc.
    If the motor step angle is 1.8°, the subdivision value is 16
    Indicates that the rotation angle of a pulse signal motor is: 1.8°/16=0.1125°

2/Motor step angle

  • The electronic pulse is sent by the main control (motor driven) such as TMC2209  A4988, etc.

  • A fixed angle of stepping motor rotation is called “step angle”.

  • The step angle of each stepping motor is a fixed value and cannot be modified.

  • There are two types of stepping motors commonly used in 3D printers, 0.9° and 1.8°.

  • 0.9° means an electronic pulse signal controls the motor to rotate at an angle of 0.9°

  • 1.8° means an electronic pulse signal controls the motor to rotate at an angle of 1.8°

  • 0.9° step angle motor: 400 pulse signals are needed for each rotation of the motor (360°)

  • 1.8° step angle motor: 200 pulse signals are needed for each rotation of the motor (360°)

  • Small step angle- is mean high controllable precision

DM115.jpg

3/Diameter of gear

OMGV2S Extruder Filament Gear φ8mm +-0.1

4/Gear ratio

OMGEXTRD Extruder   Gear ratio 1:3 That is, the motor rotates 3 cycle-360°=1080° , and the filament gear rotates 1 cycle-360°=360°

DM116.jpg

E-STEP

If using a 42 stepper motor, the step angle is 1.8°, the motor drive is 16 subdivisions, and the gear ratio is 1:3
E-STEP 363

If ​​using a stepper motor at 36 pitch, the pitch angle is 0.9°, the motor drive is 16 subdivisions, and the gear ratio is 1:3
E-STEP: 726

1-spring presses filament pressure
2-and material of soft and hard filament
The e-step value should be tested and adjusted after installation

E-step: calculation method
Use 1/16 subdivision motor,
Stepper motor step angle = 1.8°,
The diameter of the gear is 8.4mm, the stepper
motor needs 16*200=3200 signals ofimpulse to turn 360°,
Filament moving length = gear circumference = 3,d = 3.14*8 = 26.376mm
How much e-step = filament displacement 1mm:
Calculation method: 3200/26.376 = 121 pulse signal.
E-step value is 121

Gear ratio is 1:3 - E-step value needs 3 times, that is 127.39*3=363 (theoretical value)

If you use 0.9° step angle - the electronic step value needs 2 times, that is 363*2=726 (theoretical value)

Note:Some 3D printer firmware has set temperature protection, you need to turn on the hot end temperature to reach the set value before the extruder starts working. Please pay attention to safety when testing.

  • A. The pressure of the spring is different, and the filament material is different in soft and hard, which will cause the change of the gear diameter

  • B. The distance between the extruder and the hot end-different installation methods of the extruder will also affect the step value.

  • Because of A.B. reasons. The E-Step value may need to be adjusted.

  • It is recommended that different 3D printer models, or different extrusion methods: long-distance feeding filament, direct drive. Need to re-test and adjust the appropriate step value

Adjustment method:

  • A Use the controller-control the extruder to automatically send the filament 10 or 100mm filament length, and then use a ruler to measure the actual length of the extruded filament.

  • B can squeeze out 100mm and retreat 100mm. After repeating several times, check whether the position of the filament is the same.

  • If the actual distance of extruding the filament is long, adjust the step value to be smaller. If the actual filament distance is short, increase the step value.

Ender 3 V2 extruder step value modification:

  • Please write the following code (red) into a notepad, save it to a TF card, as a Gcode format file, Then insert the TF card into the printer and execute printing to modify it (the original value is 93)

M92 E363

M500

M501 Note

363 can be modified to the step value . 363 E-step uses the original motor, or the step angle is 1.8° NAMA 17 stepper motor

If 36 NAMA 14  step angle is 0.9°  motor is used, the E-step value is 726. 

DM117.jpg

Note: After modifying the step value DAT format files will be generated in the TF card The name is: EEPRO If deleted, restart the 3D printer, The original value of 93 will be restored,