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# Anycubic i3 Mega Marlin 1.1.9 by davidramiro
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This is my slightly customized version of the [Marlin Firmware](https://github.com/MarlinFirmware/Marlin), gratefully based on [derhopp's repo](https://github.com/derhopp/Marlin-with-Anycubic-i3-Mega-TFT) with his remarkable efforts to get the Anycubic i3 Mega TFT screen to work.
Feel free to discuss issues and work with me further optimizing this firmware!
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I am running this version on an i3 Mega Ultrabase V3 (for distinction of the different versions, check [this Thingiverse thread](https://www.thingiverse.com/groups/anycubic-i3-mega/forums/general/topic:27064)).
Basically, this should work on every Ultrabase version that has two Z-axis endstops.
**The new Mega-S is not officially supported. You can try your luck, but I have no means of troubleshooting issues with that machine. E-steps need to be set to 384 (`M92 E384.00` + `M500`), and afterwards calibration is highly recommended as per the instructions on the [Wiki](https://github.com/davidramiro/Marlin-AI3M/wiki/Extruder-Calibration/).**
The new Mega-S should work too, but you will need to enter those two commands to make the new extruder work:
```
M92 E384
M500
```
Afterwards, calibration is highly recommended as per the instructions on the [Wiki](https://github.com/davidramiro/Marlin-AI3M/wiki/Extruder-Calibration/).
Note: This is just a firmware, not magic. A big part of print quality still depends on your slicer settings and mechanical condition of your machine.
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[m600 demo]: https://kore.cc/i3mega/img/m600demo.jpg "M600 demo"
**A USB host (OctoPrint, Pronterface, ...) is required to use this.**
**Printing via USB is highly recommended for this.**
#### Configuration:
- Send `M603 L0 U0` to use manual loading & unloading.
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- Save with `M500`
#### Filament change process (manual loading):
- Place `M600` in your GCode at the desired layer or send it manually
- For printing via SD:
- Place `M600` in your GCode at the desired layer
- For printing via USB:
- Place `M600` in your GCode at the desired layer or send it via terminal
- Alternatively: Use `FilamentChange Pause` in the Special Menu
- The nozzle will park and your printer will beep
- Remove the filament from the bowden tube
- Insert the new filament right up to the nozzle, just until a bit of plastic oozes out
- Remove the excess filament from the nozzle with tweezers
- Send `M108` via your USB host.
- For printing via SD:
- Click `CONTINUE` on the screen
- For printing via USB:
- Send `M108` via your USB host or use `FilamentChange Resume` in the Special Menu
- Note for OctoPrint users: After sending `M108`, enable the advanced options at the bottom of the terminal and press `Fake Acknowledgement`
#### Filament change process (automatic loading):
- Place `M600` in your GCode at the desired layer or send it manually
- For printing via SD:
- Place `M600` in your GCode at the desired layer
- For printing via USB:
- Place `M600` in your GCode at the desired layer or send it via terminal
- Alternatively: Use `FilamentChange Pause` in the Special Menu
- The nozzle will park
- The printer will remove the filament right up to the extruder and beep when finished
- Insert the new filament just up to the end of the bowden fitting, as shown here:
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[m600 load]: https://kore.cc/i3mega/img/load.jpg "M600 Load"
- Send `M108` via your USB host.
- For printing via SD:
- Click `CONTINUE` on the screen
- For printing via USB:
- Send `M108` via your USB host or use `FilamentChange Resume` in the Special Menu
- Note for OctoPrint users: After sending `M108`, enable the advanced options at the bottom of the terminal and press `Fake Acknowledgement`
- The printer will now pull in the new filament, watch out since it might ooze quite a bit from the nozzle
- Remove the excess filament from the nozzle with tweezers