To use this functions include in your file the following statements:
include <bolts_sizes.scad>
use <bolts.scad>
use <chamfer.scad>
use <fillet.scad>If these files are in a diferent folder:
include <PATH_TO/bolts_sizes.scad>
use <PATH_TO/bolts.scad>
use <PATH_TO/chamfer.scad>
use <PATH_TO/fillet.scad>Check: https://en.wikibooks.org/wiki/OpenSCAD_User_Manual/Include_Statement
The include command act as if the contents of the included file were written in the including file
The use command imports modules and functions, but does not execute any comands other than those definitions