Customizable spacer with extra fetures at bottom and top side (Cutoff or Standoff).
For example: You can do hand screwdriver for nuts and nylock nuts , see "Spacer-M5x38x14_wNut.stl" - I made that for Ender3 X and Z plate spacer and realize that make a perfect screwdriver for nuts, also you can put a insert and use a counterscrew to use a key or even a electric screwdriver for fast and more torque.
Important Note: Always check tolerances for your sizes
Best if print with perimeters only, eg: set to 100 perimeters.
Always sand top surface of spacer for best contact area, and bottom if not using a smooth surface.