This simple 2020 mm construction beam is designed to print horizontally without supports.
I designed this because the std extrusions only print well upright, but then they are not as strong as horizontally printer parts.
The samples in the pictures are printed from AmazonBasics gray PETG, that is now my go-to PETG for most mechanical parts that require toughness.
Compatible with many 2020 bracketry designs.
Stronger than the std 2020 printed vertically.
Square holes remove the need for supports.
I also add an .STL of a set of plates for convenience, but there are plenty of them on the Thingiverse already.
I will probably share a few other beam profiles in the future with various size holes and extrusion style grooves.