// 40mm fan adapter for delta frames
// by zeus - zeus@ctdo.de - CC-BY-NC-4.0
// -> https://www.thingiverse.com/zeus
// -> https://github.com/zeus86 
// 2016-02-26
// ---
//some vars

$fn=24;

mnt_hole_dia=5.1;
fan_hole_dia=4;
fan_hole_dist=32.5;
fan_dia_effective=40;
base_w=40*1.75;
base_t=3;
base_h=40+2*mnt_hole_dia;
standoff_h=7;

//====================================

module standoff(){
    translate([0,0,standoff_h/2+base_t/2]){
        difference(){
            cylinder(r1=fan_hole_dia,r2=fan_hole_dia*0.75,h=standoff_h,center=true);
            cylinder(r=fan_hole_dia/2,h=standoff_h+1,center=true);
            }
        }
    }


module base(){
    difference(){
        cube([base_w,base_h,base_t],center=true);  
        cylinder(r=fan_dia_effective/2,h=base_t+1,center=true,$fn=48);
        translate([-(base_w/2-mnt_hole_dia),+(base_h/2-mnt_hole_dia),0])cylinder(r=mnt_hole_dia/2,h=base_t+1,center=true);
        translate([+(base_w/2-mnt_hole_dia),+(base_h/2-mnt_hole_dia),0])cylinder(r=mnt_hole_dia/2,h=base_t+1,center=true);
        translate([-(base_w/2-mnt_hole_dia),-(base_h/2-mnt_hole_dia),0])cylinder(r=mnt_hole_dia/2,h=base_t+1,center=true);
        translate([+(base_w/2-mnt_hole_dia),-(base_h/2-mnt_hole_dia),0])cylinder(r=mnt_hole_dia/2,h=base_t+1,center=true);
        }
    translate([-(fan_hole_dist/2),+(fan_hole_dist/2),0])standoff();
    translate([+(fan_hole_dist/2),+(fan_hole_dist/2),0])standoff();
    translate([-(fan_hole_dist/2),-(fan_hole_dist/2),0])standoff();
    translate([+(fan_hole_dist/2),-(fan_hole_dist/2),0])standoff();
    }

base();