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General information collated into the most often asked questions and answers.
NOT an official Anycubic-operated forum; just customers discussing their machines.

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12 or 24

by mcdeal

Voltage requirements of the Anycubic I3 Mega

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12 or 24

by mcdeal

Voltage requirements of the Anycubic I3 Mega

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12 or 24

by mcdeal

Voltage requirements of the Anycubic I3 Mega

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Adding BLTouch to Anycubic I3 Mega for ABL Tutorial

by Euk_rob

BLTouch on Anycubic I3 Mega (Version 2 with ultrabase) - Needs to be 8 bit version
What you need is a BLTouch probe (Affiliate link, consider buying from here if you want to give some support to this: http://s.click.aliexpress.com/e/Qr72FaY) - Cheapest price I could find, and was the one I used to code the firmware with.

Make this mount in ABS/High heat tolerant filament, and install it as per his instructions (as far away as possible from hotend) using m3 screws and nuts
Credit to Petrzmax

Download the PDF for clear instructions and images on how to install the BLTouch to the anycubic I3 Mega

Link to firmware using Marlin 1.1.8 with ABL enabled. Firmware also uses Z-endstop for G28 command to level bed, and G29 uses BLTouch to measure bed surface.
Flash this firmware: https://www.dropbox.com/sh/igl7ny8afryajq1/AADOUzbKtO8QfU5q04TysJdna?dl=0
It will use BLTouch 5 x 5 point grid
Original firmware based off derhopp and beaving - uses latest marlin build

And usual disclaimer do this at your own risk, but works well for me
PDF of instructions attached to this group

Link to facebook discussion group:

For those of you who want to play with the firmware, the uncompiled version is here:

Anycubic I3 Mega BLTouch Mount
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TO sensor abnormal

by sd2017

Just bought my i3 Mega and assembled it. When i switched it on i got "TO sensor abnormal". book says check plug on hot end which I've done. Any other suggestions?

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Anycubic I3 Mega stops during first layer

by Shmosi

Hello there!Long story short: I've been printing with my Anycubic I3Mega without problems (except the typical ones xD), but since a few days the print nearly always stops during the first layer.

Like, 80% of the time the software seems to freeze, the other 20% print fine to the end.

I've tried:

x) using an old version of Cura

x) using the most recent version of Cura

x) Updating the printer firmware

x) printing via USB (used different cables as well)

x) printing via SD (used different cards as well, formatted them etc)

x) using old gcode that already worked flawless

The problem wasn't related to anythign listed above, but it feels like the print has a higher chance of succeeding if I print via USB. When it fails, I get the following output in stderr:

2020-11-24 20:44:18,746 - WARNING - [USBPrinterUpdate] UM.Logger.logException [106]: Exception: An unexpected exception occurred while writing to the serial.

2020-11-24 20:44:18,760 - WARNING - [USBPrinterUpdate] UM.Logger.logException [110]: Traceback (most recent call last):

2020-11-24 20:44:18,772 - WARNING - [USBPrinterUpdate] UM.Logger.logException [110]: File "C:\Program Files\Ultimaker Cura 4.8.0\plugins\USBPrinting\USBPrinterOutputDevice.py", line 247, in _sendCommand

2020-11-24 20:44:18,782 - WARNING - [USBPrinterUpdate] UM.Logger.logException [110]: self._serial.write(new_command)

2020-11-24 20:44:18,789 - WARNING - [USBPrinterUpdate] UM.Logger.logException [110]: File "serial\serialwin32.py", line 315, in write

2020-11-24 20:44:18,795 - WARNING - [USBPrinterUpdate] UM.Logger.logException [110]: serial.serialutil.SerialException: WriteFile failed (PermissionError(13, ' The device does not recognize the command ', None, 22))

2020-11-24 20:44:18,803 - WARNING - [MainThread] UM.Qt.QtApplication.__onQmlWarning [406]: file:///C:/Program Files/Ultimaker Cura 4.8.0/resources/qml/MonitorButton.qml:22: TypeError: Cannot read property 'activePrinter' of undefined

2020-11-24 20:44:18,807 - WARNING - [MainThread] UM.Qt.QtApplication.__onQmlWarning [406]: file:///C:/Program Files/Ultimaker Cura 4.8.0/resources/qml/MonitorButton.qml:21: TypeError: Cannot read property 'acceptsCommands' of undefined

2020-11-24 20:44:20,150 - WARNING - [MainThread] UM.OutputDevice.OutputDeviceManager.removeOutputDevice [196]: Could not find output device with id COM3 to remove

When the error occurs, I can't send any commands to the printer (temp, coordinates, abort etc.), neither via the touchpad nor the pc (touchpad UI doesn't freeze). As well, the fan seems to go wild and heavy, the heat of the bed and the nozzles stays the same.

Thanks in advance for all suggestions

Edit: I couldn't add a video of the printer failing, but I have the same post on reddit with the video: https://www.reddit.com/r/3Dprinting/comments/k0ren5/anycubic_i3_mega_first_layer_abort/

abort Anycubic_I3_Mega first_layer freeze
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printing at different speeds and underextrusion solution?

by brunoosti

So, I try to print faster (60mm/s) supports, infill and inner walls, but when the printer finishes an outer wall (30mm/s) and goes to a faster portion (supports, lets say) it underextrudes at the beginning of the line.
Is there a way to remedy this without linear advance?
Despite improving extrusion, I noticed LA can increase print time a lot sometimes, because of the deacceleration on corners (mostly when printing zigzag supports).

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Ultrabase is failing

by majstorsky

So after 3 years of use edges of prints dont stick anymore, even small prints in middle of print surface. Ultrabase is old type , glued to alu plate and with screws so im not sure how to proceed. Did anyone managed to remove glass without bending alu plate?

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Anycubic Mega-S constant Y layer shifting

by lord_blackfang

Hello folks, I am at the end of my rope here.
Bought the printer for Black Friday 2019, and it worked flawlessly with no mods for about half a year bar the usual hotbed wire breakage.
Then suddenly it started making odd Y shifts. These almost always happen at the same spot when repeatedly printing the same gcode file, usually about 3 hours into the print. The exact position changes if I rotate, scale or otherwise alter the file and reslice. Usually it's when printing infill but I've had it happen in files without infill as well. The shifts are about 1-2 mm long, sometimes there is a single shift, sometimes a few in rapid succession (from 0 to a few layers apart). Prints that take less than 3 hours usually come out unscathed.

I recently discovered that if I try to move the bed with the touchscreen commands, or via terminal from the PC, the bed gets stuck in a particular spot and won't move further in one direction.

Things I've tried
1) I swapped the X and Y stepper drivers and adjusted voltage. Layer shifting was unaffected and remained on the Y axis.
2) Bought a new Y motor.
3) Checked for mechanical resistance. When disconnected from the belt the bed moves freely and slides around at the slightest tilt, so it's not snagging on the rods. When connected but powered off and moved by hand the resistance is uniform.
4) Checked for software flaws. Upgraded Cura, no change. Flashed to Marlin 1.1.9, no change. Tried old gcodes that printed flawlessly in the past, getting Y shifting now.
5) Ruled out overheating as the shifts happen in the same place again if I restart the print immediately, so are not dependent on how long the printer has been running.

I believe I have ruled out all possible mechanical and software causes and faulty drivers, leaving only obscure electrical issues, which are sadly beyond my skillset. Any ideas? The only test I can think of now is to replace the motherboard, but at this point it seems better to get a new printer and stop sinking money into something I don't know how to fix.

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