I was watching on one of the open build videos, they used of some 3D printed end plates, I have taken a screen catcher of them. Does anyone have the 3D files in Sketchup please. They are to fit on the same size track.
The first picture is not an Openbuilds extrusion. What video are you referring to? It would be very simple to replicate either of those in Fusion 360 or sketchup. Have you searched thingiverse?