Kobra_Max VS Marlin

Before I converted my Kobra Max to BTT SKR Mini, I was looking into firmware upgrade and also flashed it with available updates made by various users (https://github.com/wabbitguy/Kobra_Max/releases). It improved printer, a bit, slightly... but I was still unhappy. I also heard that input shaping and linear advance are more or less experimental features in Marlin and not so well worked out. Hell, even Prusa rather used their own implementation for their MK4.

For updating printer fw, follow instructions from here: https://github.com/wabbitguy/Kobra_Max/releases/tag/v1.2

Install wabbitguy’s firmware (https://github.com/wabbitguy/Kobra_Max) (no hardware mods required)

Latest custom firmware version with many improvements (https://github.com/wabbitguy/Kobra_Max/releases)

Sure :) https://github.com/wabbitguy/Kobra_Max

Damaged strain gauge and wrong thermistor defined in the firmware. Had the same issues. Call Anycubic, they will send you replacement strain gauge, but it will take literally months (in my case I raised the issue with their support on the beginning of January, at the beginning of March I got the message that replacement parts are on the way. They are still in transit). So grab a replacement part (strain gauge for Kobra Max / Vyper E, it will cost you $20) and replace it. Stock firmware is Crap with capital C, but before you do this - check the temperature of your hotend. If you don't have a multimeter with temperature and K type thermocouple - buy one. You will be using it with 3D printer and they are cheap. So preheat the hotend to 190 degrees (PLA preheat) and touch the nozzle with the thermocouple. If you will be getting 190ish, you are grand. However I can bet you will get 215-220. Next do the filament change, or manually set up 230 degrees. Again measure the nozzle temp. If you will be getting 265-275 degrees - that's the case I am talking about. Anycubic defined the temperature sensor as type 5 when it should be type 11. Now you have two options. 1 - remember that 171 degrees set is the actual 190 degrees and print PLA with that or 2 get a wabbitguy firmware (https://github.com/wabbitguy/Kobra_Max ) check in source/Marlin/Comfiguration.h if the thermistor type is set to 11, if not - set it to 11 (you are looking for #define TEMP_SENSOR_0 line - currently at 442 line) compile it and follow the update procedure that's listed on that GitHub page.

All that said, I also just found this a couple of days ago: https://github.com/wabbitguy/Kobra_Max. The first print with it (using my own PrusaSlicer profiles) actually seemed a lot better than the stock firmware, but then I noticed the loose connections and haven't had a chance to dig in to that.

I decided to look back at his files and found he has a firmware update similar to the Zombie one i saw going around. Kobra Max Firmware, which is great.. it re-enables linear advance, makes the ABL 49 points instead of 25 plus more.. and the best part.. (.1) increment adjustments for your Z offset.

There is _a lot_ wrong with Marlin. It is a complex codebase, full with ancient artefacts, litterred with preprocessor ifdefs every 2-3 lines of code, dynamic includes in the middle of CPP files, etc[1]. It's about as unreadable as C++ code gets--well, I guess it's not template metaprogramming.

Klipper by contrast is a breeze to read through[2].

I am very grateful for Marlin, for all of reprap, and everyone who has contributed to it. But saying there is nothing wrong with it is straight up misguided.

[1]: https://github.com/MarlinFirmware/Marlin/blob/bugfix-2.1.x/M...

[2]: https://github.com/Klipper3d/klipper/blob/master/src/lcd_hd4...

I think you are mistaken. I can't speak for implementations preceding the Ender 3 V2, so what you're saying may have been true at some point for other machines. However, here you can see Marlin developers confirm that there is an EEPROM on the stock E2V2 board using diagrams from Creality and photographic confirmation. Here is the datasheet for the EEPROM. Here is a thread discussing this Marlin release, and also the then-recent release of official Creality firmware which resolved the same issue. Since the stock firmware is based on Marlin, and at the time Marlin did not support this type of EEPROM, the EEPROM was not usable at launch. Any mainstream firmware (official or third-party) from the last three years will be using the onboard EEPROM unless the user intentionally specified otherwise.

pull latest Marlin from github: https://github.com/MarlinFirmware/Marlin

Also, checked the following discussion but seems like I need to update the firmware to be able to comment that like right? Temperature variance monitor tweaks by zeleps · Pull Request #23571 · MarlinFirmware/Marlin · GitHub

i spent some time and successfully rebased Kobra 2.8.2 OG firmware from an unknown Marlin ~2.0.8 frankenstein to a clean latest (as of now) release (not bugfix) 2.1.x -- v2.1.2.1 + 1 commit

As an example, check the macropocalypse in Marlin - but the actual trigger for me to start was Reprap firmware doing a floating point divide in interrupt context while targeting AVR8 core…

Any change of thermistor or to a PT100/PT1000 will require recompiling the firmware, because every type has different characteristics. Marlin uses an internal table to calculate the temperature for whatever reading it gets from the CPU's analogue-to-digital converter. It has many tables for different thermistors, but only one is ever incorporated at compile time. So you have to specify which type you're using. You can see the commonly-used types in the list in Marlin's Configuration.h file, in the section headed // @section temperature. The tables themselves are in Marlin/src/module/thermistor.

FWIW It IS open source but the GNU General Public License v3.0 rules apply. https://github.com/MarlinFirmware/Marlin/blob/bugfix-2.1.x/LICENSE