fully customizable openscad fanguard

Supported fan size: 20,30,35,40,50,60,70,80,92,120
customizable parameters:
- size and height fanguard;
- diameter and height of central cone;
- thick of rim;
- height of bars;
- thick of walls;
- cone type: ellipsoid, prabaloloid, cone

distance between screws found in google, not checked (checked only 40mm).