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Quick and dirty 5 minutes craft: Draw a rough shape, define the contact surfaces & load, click run, and get the optimized shape. The last step is converting the output to a printable shape and running one more simulation to double-check it is strong enough.
This particular holder is a filament spool holder designed to be loaded with up to 5.5kg of filament (1x2.5kg, 3x1kg).
I take it there's another holder on the other side.
May I ask why the complex shape, rather than just having a triangle with two points on the 4040 rail and the third point being the axle position?
I imagine the "optimized" there means it has the maximum weight support with the minimum amount of filament.
This shape certainly beats a triangle with only the walls or with just a bit of infill. And it surely takes less filament than one with near to 100% of infill.
Nature loves triangles.
https://en.wikipedia.org/wiki/Michell_structures