Geeetech A20 User manual

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Geeetech A20 3D Printer
User Manual (V3.00)

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Content
1 Attention ................................................................................................................................4
1.1 Safety instructions.......................................................................................................4
1.2 Factory test before delivery ........................................................................................4
2 Machine parameters………………..............................................................................................5
3 Packing list……………………………………………………………………………………………………….…….……….…6
4 Machine Overview ……………………………………………………………………………….…………………………..7
5 Assembling .............................................................................................................................8
5.1 Assembling the main frame ........................................................................................8
5.2 Wire connection..........................................................................................................9
5.3 Check the power input mode....................................................................................12
5.4 Check the filament ....................................................................................................12
6 First print ..............................................................................................................................15
6.1 Level the print bed ....................................................................................................15
6.2 TF card printing .........................................................................................................17
7 Introduction to the LCD menu..............................................................................................20
7.1 Tree diagram..............................................................................................................20
7.2 Main functions ..........................................................................................................20
8 Software setting ...................................................................................................................24
8.1 Install driver...............................................................................................................24
8.2 Install slicing software ...............................................................................................26
8.3 USB printing ..............................................................................................................35
8.4 TF card printing .........................................................................................................39
9 Function introduction...........................................................................................................40
9.1 Power loss-resuming capability
.................................................................................40
9.2 Reset button..............................................................................................................41
9.3 Filament run-out sensor (Optional) ..........................................................................41
9.4 3D touch for auto bed leveling (Optional).................................................................42
10 FAQ (Frequently Asked Questions).....................................................................................43
10.1 Abnormal extrusion.................................................................................................43
10.2 The gear of the extruder skips and makes an abnormal noise ...............................43
10.3 First layer abnormal ................................................................................................43
10.4 Layer shift................................................................................................................43
10.5 Print stopped...........................................................................................................44
11 Declaration .........................................................................................................................45
11.1 Terms .......................................................................................................................45
11.2 Disclaimers ..............................................................................................................45

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Thank you for choosing Geeetech products!
[Important] Please read the instruction manual
carefully before using this machine.
Official site: https://www.geeetech.com/
Email us for technical support: https://www.geeetech.com/contact_us.htm
Facebook Group:

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1Attention
1.1 Safety instructions
•Please switch to the correct local voltage (110V-220V) before turning on the printer. Be sure
the switch is in the correct position or it will damage the power supply unit (PSU).
•Be sure all wires are correctly connected before turning on the printer.
•Don’t touch the extruder head or hot bed when printing as they generate high temperature
which may cause burn.
•Don’t leave the printer unattended when printing.
1.2 Factory test before delivery
In order to ensure the quality, each printer is tested in the factory before delivery. As a result,
there may be residue in the extruder head or on the hot bed, but it should not affect normal use.
We provide the spare nozzle in the accessory kit just in case.

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2Parameters
•Printing parameters
Printing technology: FDM
Printing volume: 250*250*250mm3
Printing accuracy: 0.1~0.2mm
Positioning precision: X/Y: 0.011mm Z: 0.0025mm
Printing speed: 60mm/s
Nozzle quantity: 1-in-1-out single nozzle
Nozzle diameter: 0.4mm
Filament: Diameter 1.75mm; ABS/ PLA, etc
Environment temperature: 10℃-40℃
Operating system: Windows/Mac/Linux
Slicing software: Repetier-Host, EasyPrint 3D, Cura
File format: .STL/.Gcode
•Electrical parameters
Power input: 100-120V/200-240V
Power output: DC24V/14.6A，350W
Connectivity: TF card, USB
LCD screen: LCD 12864 screen
•Mechanical parameters
Printer size: 442x447x480 mm3
Package size: 510x495x305 mm3
Net weight: ~7.8kg
Gross weight: ~10.2kg

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3Packing list
Please check the parts/accessories when you receive the printer (As shown below). If any spare
parts are missing, please contact your sales representative.
Gantry kit Bottom kit Filament holder kit
Nozzle*2 Filaments（1 random
color ）Teflon tube & Zip ties
Power cord Tool kit Mouse pad
TF Card Machine installing screws User guide
USB cable

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4Machine Overview
(Picture 4-1) (Picture 4-2)
(Picture 4-3) (Picture 4-4)
○
1E
AGantry frame A○
2E
ALCD12864 screen A○
3E
AKnob A○
4E
AReset button A○
5E
AY axis A○
6E
ABottom kit A○
7E
AZ axis
end stop A○
8E
AX axis end stop A○
9E
AFilament holder kit A○
10E
ATeflon tube A○
11E
AExtruder head A○
12E
AHot bed A○
13E
AX
axis motor A○
14E
AZ axis motor A○
15E
AY axis motor A○
16E
APower voltage selector switch A○
17E
AY axis end stop A○
18E
AExtruder wire interface A○
19E
APower switch A○
20E
APower socket A○
21E
AUSB port A○
22E
ATF card slot

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5Assembling
5.1 Assembling the main frame
The main frame consists of the gantry kit and the bottom kit, filament holder, and screws. See
picture (5-1).
(Picture 5-1)
•Assemble the gantry frame and base from bottom to top with 4 M5x30 screws and 4 M5
spring washers. See picture (5-2).
(Picture 5-2)
Assemble filament holder and attach to the top of the frame closing to the extruder
side, with 2pcs M3x6 screws and 2 T- nuts M3, as shown picture (5-3).
Gantry kit Bottom kit Filament holder kit
Machine installing screws Tool kit

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(Picture 5-3)
5.2 Wire connection
•Insert the Teflon tube into the quick-insert connector of the extruder. Details see picture
(5-4).
(Picture 5-4)
•Plug the extruder cable into the socket of the extruder head adapter plate, and the buckle
must be fastened. See picture (5-5).

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(Picture 5-5)
•Connect the motor wires of E0. See picture (5-6).
(Picture 5-6)
•Then the extruder wire and the motor extruder wire are fixed into the small hole on the
backside of the screw with the Cable tie to avoid the wire harness touching the model
during printing. In addition, the position the harness fixed needs to reserve the length of the
Z-axis at the maximum height. See picture (5-7).
(Picture 5-8)

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•Connect the wires of X axis’ motor and end stop. See picture (5-8).
(Picture 5-8)
•Connect the wires of Y axis’ motor and end stop. See picture (5-9).
(Picture 5-9)
•Connect the wires of Z axis’ motor and end stop. See picture (5-10).
•
(Picture 5-10)

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5.3 Check the power input mode
The factory default voltage is 230V. You need to choose the correct voltage according to your
local standard requirement. See picture (5-11)
Note: Be sure the voltage is switched to the correct one.
(Picture 5-11)
5.4 Check the filament
Put the filament on the spool holder. Please pay attention to the feeding direction of the filament.
See picture (5-12).

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(Picture 5-12)
Since the filament is bent, the first section of it needs to be straightened by hand and trimmed to
make it easier to insert the filament into the feeder. Press down the lever handle of the extruder
and insert the filament into the feeding tube until it reaches the extruder head. See picture
(5-13).

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(Picture 5-13)
When print PLA, set the target nozzle temperature about（190~210℃）. When the temp is stable,
control the extruder filament feeding on LCD screen (“Move axis”), feed until there is molten
material flowing from the nozzle.
Observe the nozzle, if there is no filament stuck and the filament is coming out smoothly, then
stop filament feeding, clear the nozzle with tweezers. See picture (5-14).
(Picture 5-14)

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6 First print
6.1 Level the print bed
The first layer is basis to a successfully printed model. The factory default setting is a little high in
order to avoid scratching the hotbed with the nozzle, so users need to adjust the distance
between nozzle and hotbed again. After the first-time bed leveling, users don’t need to level the
bed again.
•Rough leveling
Home the printer first (“Prepare”> “Auto home”), then it shows the option “Level corners” on
the LCD screen. Put a piece of A4 paper on the platform, click “Next corner”, the extruder head
moves counterclockwise from the bottom left corner to the four corners of the platform. See
picture (6-1, and 6-2).
(Picture 6-1)
(Picture 6-2)
When the extruder head moves to the left bottom, adjust the corresponding knob until the
distance between the nozzle and bed is about the thickness of a piece of paper (about
0.1-0.2mm). Slide the paper back and forth to see if you feel a slight resistance. If yes, it means
the leveling of this corner is finished and you can proceed to level the rest corners with the same
method. See picture (6-3).

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(Picture 6-3)
•Accurate leveling
If you level the bed with A4 paper, the first layer maybe too high, too low or moderate.
a. Too high: the distance between the nozzle and bed is too far, which may cause the filament to
not stick or not stick well. See picture (6-4).
(Picture 6-4)
b. Too low: the distance between the nozzle and the bed is too close, which prevents the filament
from coming out and causes the extruder gear to click, and even worse, scratch the nozzle on the
bed. See picture (6-5).
(Picture 6-5)
c. Moderate: Extrude the filament properly and evenly stick on the bed. See picture (6-6).
(Picture 6-6)
In the case of too low and too high, adjust the knobs under the platform till they are moderate. It

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may take some trial and error to achieve the best result. An example of good first layer, see
picture (6-7).
(Picture 6-7)
Note:
•If turn the knobs clockwise, the platform will rise, and vice versa.
•Avoid the nozzle touching the bed; use a piece of A4 paper. Or it will scratch the bed.
For more details, please refer to this link:
http://geeetech.com/forum/viewtopic.php?f=112&t=62296
6.2 TF card printing
Insert the TF card into the slot. See picture (6-8).
(Picture 6-8)
Press and rotate the knob to enter the main menu. Select the option of "Print from SD". See
picture (6-9).

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(Picture 6-9)
Choose the files in the TF card. See picture (6-10).
(Picture 6-10)
The printer will heat automatically. When heating done, the printer will start printing until the
print is complete. See picture (6-11).

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(Picture 6-11)

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7 Introduction to the LCD menu
7.1 Tree diagram
(Picture 7-1)
7.2 Main functions
LCD rotating knob:
•Press the knob: Confirm or enter the next menu.
•Rotate the knob: Roll the select options or change parameters.
LCD homepage, see picture (7-2):
1. Extruder temperature: Current temp/target temp