// stoffel-hotend tripod fan mount for deltas
// by zeus - zeus@ctdo.de - CC-BY-NC-4.0
// -> https://www.thingiverse.com/zeus
// -> https://github.com/zeus86
// 25.09.2014

mount_hole_distance=50;
height=40;

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

mount_arm_w=8;
mount_arm_block_l=mount_hole_distance/2;
mount_arm_l=mount_hole_distance/2+mount_arm_w/2;
mount_hole_dia=4.0;

fan_size=40;
fan_wall_t=2;
fan_wall_h=fan_size;
fan_wall_w=fan_size;
fan_hole_distance=32;
fan_hole_size=3.5;
fan_wheel_d = fan_size*0.95;

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


// =============  PILLARS  =============


module base_plate(){

	module base_mount_hole(){
		cylinder(r=mount_hole_dia/2,h=height*2,center=true,$fn=16);
	}

	module base_pillar(){
		difference(){
				translate([-mount_arm_block_l/2,0,0]){
					cylinder(r=mount_arm_w/2,h=height,center=true,$fn=12);
				}
			translate([-mount_arm_block_l/2,0,0]){
				base_mount_hole();
			}
		}
	}

	difference(){
		union(){
			rotate([0,0,0]){translate([-mount_arm_block_l/2,0,0]){base_pillar();}}
			rotate([0,0,120]){translate([-mount_arm_block_l/2,0,0]){base_pillar();}}
			rotate([0,0,-120]){translate([-mount_arm_block_l/2,0,0]){base_pillar();}}
		}
	}
}




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


module fan_mnt_hole(){
	rotate([90,0,0]){cylinder(r=fan_hole_size/2,h=fan_wall_t+0.1,center=true,$fn=16);}

}

module fan_holes(){
	translate([-fan_hole_distance/2,0,-fan_hole_distance/2]) {
		fan_mnt_hole();
	}
	translate([fan_hole_distance/2,0,-fan_hole_distance/2]) {
		fan_mnt_hole();
	}
	translate([-fan_hole_distance/2,0,fan_hole_distance/2]) {
		fan_mnt_hole();
	}
	translate([fan_hole_distance/2,0,fan_hole_distance/2]) {
		fan_mnt_hole();
	}
}

module fan_wall(){
	difference(){
		cube([fan_wall_w,fan_wall_t,fan_wall_h],center=true);
		rotate([90,0,0]){cylinder(r=fan_wheel_d/2,h=fan_wall_t+0.1,center=true);}
fan_holes();

	}
}


// ============  DRAWING  ============


base_plate();


rotate([0,0,90]){
	translate([0,-mount_arm_l/PI-mount_hole_dia*1.5,0]){
	fan_wall();
	}
}

rotate([0,0,210]){
	translate([0,-mount_arm_l/PI-mount_hole_dia*1.5,0]){
	fan_wall();
	}
}

rotate([0,0,-30]){
	translate([0,-mount_arm_l/PI-mount_hole_dia*1.5,0]){
	fan_wall();
	}
}