I changed the source design by expanding the bar to cover the entire 2020 profile.
You can adjust Z value in the slicer to get the length you need.
You can print without any support at the bottom.
I tested "vase mode", but standard quality is much better.
This element has a height of 230mm without any support.
To ensure smooth bonding, I printed without top and bottom layers.
Zero infill give a high flexibility and ease of (de)assembly.
It's almost no gap between two parts. Almost invisible.