Function parametric_plate 

pub fn parametric_plate() -> Program

A plate designed by its parameters: width and depth — half the width, unless placed otherwise — extruded thickness thick, and a blind hole in its middle sized for the screw chosen from a table of sizes, and its colour. The hole’s sketch, on the plate’s top, projects the top, and puts the hole in the middle of it. The plate is meant to be placed with other values, and everything follows.