Marlin firmware source code is incomplete

[that-ambuj]

As mentioned in this section: https://1coderookie.github.io/Kobra2NeoInsights/firmware/fw_marlin/ One needs to follow the guide on reddit with Marlin source code from Anycubic at hand.

However, halfway through following the guide I realised that the file anycubic.uvprojx is missing from the source code and I realised that the guide only works for Kobra Neo and the code for Kobra 2 Neo cannot be compiled or has to be compiled in some other way.

I want to increase the serial baudrate and the buffer size for my printer which is probably too low by default (baudrate: 115200) because I'm facing stuttering issue while running octoprint on a fairly powerful phone.

If anyone knows how to compile the Kobra 2 Neo firmware, please help me out here.

@1coderookie Please double check that my assumption is right and update the infosite accordingly. It's been really useful to me and I don't want others to be misguided by it, Thanks for the good work.

[1coderookie]

Hi,
thanks for reaching out!
This is interesting, but I'm afraid I can't help. I can't check on it as I don't have the K2 Neo and I don't have the program for the Marlin stuff as well. You could open an issue at AC's GH repo, but I doubt they'll add it tbh (I personally switched to Klipper and I'd suggest to do the same in your case, if you really think it's an issue with what you mentioned), but I'll add a note and link to this discussion.
But: I don't really see where it should be caused by the baudrate or the buffer size of the USB connection - even when using OctoPrint, the whole file gets send to the printer first, then it reads the data from there. Unlike Klipper, where it sends the commands one after another.

Does it happen with every print? Or only with certain complex files or models or so?
And what exactly happens?

[that-ambuj]

I just started printing with the SD Card and there are 0 hiccups or stutters so far.

Update: just printed and observed the same file and it's printing perfectly fine now.

[that-ambuj]

@1coderookie I think you're not facing the issue with the baudrate because you previously mentioned you print from the SD Card and I'm assuming you do that for the other printers, you probably won't have experienced the same thing.

[1coderookie]

No, I'm using Klipper at all of my machines, I'm not printing from SD at all. I said I would do so, to check if the issue is the same since you didn't answer my questions if you already did that.

[that-ambuj]

I just started printing with the SD Card and there are 0 hiccups or stutters so far.

Update: just printed and observed the same file and it's printing perfectly fine now.

@1coderookie I answered the question in the previous reply. There's no issue printing the same file from sd card but the issue is there on octoprint.

[1coderookie]

Yes, I saw that, but before that you didn't and that's why I wrote "I'd still check..".. ;)
Anyway, if that works now, then at least it's clear that it's really related to your OctoPrint solution somehow.

[1coderookie]

I just added a warning box: https://1coderookie.github.io/Kobra2NeoInsights/firmware/fw_marlin/

@jojos38 Do you maybe know anything about this problem with that missing file and what to do about it..?
Seems that someone else (or is it you @that-ambuj ?) came across the same issue at reddit, I must have missed that one.. :(

[1coderookie]

Got it, thanks again for reaching out!
True, but if really files are missing which would necessary to build their sources, then they'd need/have to add those I reckon? Dunno how it's about that in terms of GPL tho.. Sure, hopes aren't high that they'll fix it, but we never know..

[that-ambuj]

There's only one way to find out and I might as well just do it.

[1coderookie]

If you have a reddit account, maybe make a post there as well, like "hey, any news, I have the same problem". Then I'll make one as well where I mention some ppl who work for AC, maybe that will help.

[that-ambuj]

I just commented on the post, let's see if they found something. I think most likely not.

[that-ambuj]

@1coderookie Hey! I have some news from the reddit post. The guy replied and he said that he has the same issue with stuttering in octoprint, I don't think that's a coincidence.

Here's the link: https://www.reddit.com/r/anycubic/s/xaa63frRs2

[GNN3]

.I still managed to compile Marlin on Anicubic Cobra 2 Neo.
There is one missing file in the drivers for this printer on github.

[GNN3]

Here is a small assembly guide

[that-ambuj]

@1coderookie What do you think about this? I'm going to try this.

[that-ambuj]

@GNN3 Thanks a lot for this. I actually worked!

The missing platformio.ini is now added to the repo but the files for the board are missing from platformio extension for vscode itself, I think there should be a way to add that through a PR.

@1coderookie I'm still finding ways to modify the firmware in order to fix the stuttering issue, I'll update you when I fix it.

[1coderookie]

@GNN3 @that-ambuj Sorry for being so late guys, but thanks for the info!

[that-ambuj]

@1coderookie So I think you should mark @GNN3's reply as the answer and probably update the infosite to include the guide in a translated version.

[that-ambuj]

@1coderookie I am now able to compile the firmware thanks to @GNN3 and I fixed the issue with stuttering.

In order to fix the stuttering, I had to enable MEATPACK in firmware and add the respective plugin in Octoprint. I also increased the buffer sizes for good measure and enabled some features I wanted. However, just to warn others, increasing the baudrate made things worse.

All the fixes are available here for people to compile themselves.