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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S42B closed loop driver controller

by BrianEIS

I purchased the kits to add to existing stepper motors. Getting the magnets installed was the hardest part of the physical install. The rest was straight forward. Currently, I have one each on the X and Y axes. They power up, oled screens written fine. Connected them to the motherboard according to what directions I've been able to find. Thankfully, there's a good bit of info on the correct placement of the adaptors that replace the original stepper drivers. I followed Tech Teacher's instructions on upgrading MarlinFirmware, using the configuration file found on Anycubic's website. That was easy enough, too. Sadly, that's where the positive experience ended.

After setting the DIP switches for calibration and connecting the oled, I selected calibration from the menu and ran it. When running calibration, the motor is supposed to move in one direction for half the calibration period, then reverse direction and move back the other way. It should end up where it started, or at least fairly close. In my case, with both the X and Y axes motors, they sort of juggled in place.

Looking for anyone who might be able to explain what I may have done incorrectly and help me to get it right.

Thanks in advance for your time, help, and advice.

Edit - from my experience, I believe that it may not be possible to set up the Z-axis with these S42B boards.
Still not able to run in closed-loop mode. Open-loop mode works fine.

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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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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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