I had a project that required a bunch of U brackets to clamp down components. 
It made sense to knock up a parametric model.  I'm sharing it here in case anyone else needs something similar.  
Brackets can be used as surface, wall, table mounts etc for just about anything at just about any size.  Designed to print on its side for best strength, optimised for printing with no supports.

A brim is recommended though as it's a skinny piece.  

Includes an optional lip (set to zero to not use) to locate the item you're clamping side to side as well.

Model parameters can all be adjusted in MakerWorld by clicking the Customize button