Linear rail fully 3D printed

Most important thing: Print parts separately to achieve better tollerance.
My experiments ended with conclusion that horisontal positioning of rail in cura gives better result so i recoommend that instead of vertical.
Same is for runner block. If you use printer with moving bed, decrease printing speed for better quality.
Recommend brim 4mm to use, and retraction at layer change.

I use ender 5 pro, excellent maschine :)