Add M600 support about marlin-ai3m HOT 12 CLOSED

Alright, should be ready to use!

Test release download: https://kore.cc/i3mega/download/testing/m600/

Instructions are added here.

Looking pretty cool I think!

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@rug156
I just fixed the issue where the print doesn't start until you send M108.

It was a weird rx buffer overflow which caused an M105 command get sent as M1 - which is a GCode to pause the printer.

I'll add the fixed release in a few minutes.

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@rug156, thank you. I did miss the configuration step in the readme.

@davidramiro you have done a fantastic job with this firmware. Thanks for all your hard work!

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I can enable everything that's needed for M600 to work, though this command is generally meant to be used with a regular LCD display, not a custom TFT screen like the i3 Mega has. This Marlin fork has the TFT screen pause button changed to use M600, though I do not want to modify the default functionality on this firmware.

If you are fine with using M600 (pause, park nozzle and unload filament) and M108 (load filament and resume) via serial, I can try to enable it on this firmware. If you need this to work from the screen, feel free to try out the version I linked.

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As I do not want to work with other firmwares than yours I would absolutely appreciate if you could enable M600. I have no problem using Pronterface to send serial commands to the printer.

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The next big step for this great firmware!
Thank you very much for the amazingly fast reaction time to my request.
A quick first test was successfull. I connected to the printer with Pronterface and then started to print via display. The printer heated up but did not start until I sent command M108. It proceeded to the location where I set the M600 command in the GCode, went to changing position with sounds etc. and resumed correctly when I sent next M108 command.

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Glad you got it to work!

I am curious why the print didn't start until you sent M108. Did something appear in the terminal?

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Found out the reason. Pronterface - at least for me on the latest macOS version - constantly sends out M105 to check the temperature instead of using M155 (temperature auto-reporting) which is the recommended way of doing it. Sending M105 while the printer is heating up with M109 causes the firmware to halt and wait for user input for some reason. I'll investigate further tomorrow.

Thanks for mentioning this, I would never have noticed!

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I'm not sure if any of this in intended behavior (I'm new to 3d printing), so I wanted to point out my experience with this recent addition.

I started a print from the sd card via the touch screen and later in the middle of the print I sent the M600 command via pronterface. It paused the print, moved the print head and beeped (can't remember the exact order those happened in) but it did not retract the filament. If I send an M600 B4 U-578 then it will retract the filament to right about the start of the bowden tube, but it beeps after retracting and not before.

In either of the cases above, when I have changed my filament and I issue the M108 command via pronterface, it only inserts the filament about 30mm into the tube far from the actual nozzle and the print won't work because no filament will get extruded for about another 558mm.

I should also add that I am on an i3 Mega version 3.

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I'm not very familiar with the pause function myself, but as I understand it, since M108 has no parameters and simply breaks out of the pause, you'd have to specify the load length before. Marlin docs say M603 L578 U578 would work like you intended, though I didn't try.
What you were seeing after M108 was simply a purge:

#define ADVANCED_PAUSE_PURGE_LENGTH         50  // (mm) Length to extrude after loading.

What I did try was setting the parameters in EEPROM via M603. Defining the length before resulted in the correct loading and unloading with an M600, no parameters needed then of course.

That being said, M600 is and was always intended to be used with a generic Marlin LCD screen that allows the user to better control the behaviour. Headless mode like we are using it is not a very elegant way, though it was luckily included in recent changes.

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Thank you! Got a bunch of helpful suggestions and feedback like this. I would have never known that M600 is that easy to use.

I will now try to get the unload and load/purge lengths right for the bowden tube. 578mm was too long for my taste, a quick test with 560mm is almost where I want it to be.

Edit: I think M603 L530 U555 are good values. I've added a picture to the readme to avoid confusion on how much filament to insert.

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After some more testing, I'll consider this feature working. ☺️

Feel free to provide further feedback and suggestions.

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