I found the thermistor cable terminal looks like this that'a why the connection is unstable because of machine moves. So I had to put something into it, the terminal should be like underneath one.

1 : Check the wires 3 : Stop using it before change the code for servo otherwise it will break the servo check Makertech ForumHome -> Assembly -> Servo not switching properly from Chris D 4, 5 : check the platform position DSE: If you're building with the Dual Switching Extruder, mount the platform 75mm from the left of the extrusion. That's all I know so far, Good luck to you.

Even if you are using the auto leveling, you have to do manual bed leveling. I had same problem and I found out the Y Motion frame is not horizontally equal. Because of motor and frame weight, the left side is lower than right side. Check the frame first, then tight up springs on the platform, home all, then do Stage 10, step 27 on build guide. You should make same Z value each side of platform and center. CHECK Y MOTION FRAME~~

I also want to upgrade to TMC2100 or TMC2208 Have to change lots of configuration for that. I found it is bit easy to upgrade to TMC2100, but lots of change for the TMC2208 in configuration.h Here is helpful YouTube, you can learn how to change the configuration.h file for TMC2208 https://www.youtube.com/watch?v=7VHwcEroHPk&t=1108s I have not try it yet, I can not understand fully what he said, because I am not using English for my language. Hopefully you can understand. And please leave comment for all of us.

Just change head position?

When I first installed the arm, everything worked for maybe about 30 minutes. Now, when I power it up, the arm doesn't move at all on power up. If I choose to move the arm to hotend 2, it works just fine, but if I try to move back to 1, it doesn't move. And now it is dead. So I got a servo from RC car fortunately, it works fine but opposite way. When I choose 1, it turned left. How do I can change the direction?

I did it right with your help thx

I had a same problem in first print. I don't know why I also wait for others comment