Here is the drag chain that my brackets are sized for. I bought three 1 meter lengths, and had only a few segments left over.
Here is a screen shot of just the 3D printed parts I have on my SO3 XXL. There are 10 unique 3D printed parts, and 13 total parts.
The only part I am not happy with is the brick red part under the red part. It clamps onto one of the stepper motor spacers, and it works just fine, but it “wiggles” back and forth if you bump into it. It bugs me and I am finally going to redesign it so it is more sturdy. It has lasted just fine without issues for the last 18+ months, but now that I am going to release it into the wild, I need to change it first.
I am uploading pics to imgur, and when they are done, I will post the link here so you can see the parts installed on my machine. Imgur is being difficult.
Here are the files in my Google Drive folder. I updated the wobbly bracket by making the clamping portion 1" wide - the same as the spacers, and shortened the gap between them by 0.050", so they should clamp tight to the two stepper motor spacers.
