Trying to make a config for the Anycubic Kobra which has 3 TMC2209 and 1 TMC2208

General Discussion
1

Hi, so I’ve been trying to make a config for the Anycubic Kobra and I can’t get it to work because they made weird stuff on their motherboard

Here is the config: [stepper_x]step_pin: PA5dir_pin: PA4enable_pin: !PC3microsteps: 16rota - Pastebin.com
Here is their Marlin source code: ANYCUBIC-3D/Kobra (github.com)

And here are all the information I have:

  • In pins_AC_TRI_F1_V1.h in the source code you can find the USARTS at the bottom and all the pinout
  • In Configuration_adv.h in the source code you can find the addresses they use line 2514
  • A guy on Reddit said: 1. “3 TMC2209 (X=0, Y=1, Z=2 addr) and one 2208 (E0 and it’s without addr) on same UART The thing is it causes Klipper to not work because X and E are on the same address”
  • He also said he was able to make it work doing this: “I’ve removed R65 and made wire to C65 (+5v) so new adr for X got 3 and it worked like a charm.”
  • If I set the extruder to TMC 2208 on address 0 I can make it move (before Marlin stops the printer because it cannot communicate with the motor)
  • If I set the X to address 0 it also works before Marlin stops the printer

For now I’m stuck, I have no idea how I can make this work, considering it works on Marlin

Thanks in advance!

2

Hi, felly Kobra user here. There’s another reddit post in the same sub where you found your information that talks in more detail about whats going on:

[Anycubic] used 3 TMC2209 clones and 1 TMC2208 for extruder on one UART. And they don’t know that 2208 has adr 0, so they used adr 0 for X also. Only way to fix it - resolder R65 to R66 place (see pic - delete R65 and solder it to R66)

https://www.reddit.com/r/anycubic/comments/ynvbj0/anycubic_kobra_working_config

This is similar to the information you posted, but on that link there’s a diagram and several people who are discussing details involved. I haven’t done the deed yet, but I’m looking forward to klipperizing.

3

Hey! Thank you for your answer, I tried this back then but I did something wrong and killed the motherboard. So I bought and SKR 3 EZ and got no issues ever since