parametric arrowheads - pointe de fleche parametrique

thingiverse

a parametric arrowhead difficult to print, Brim death and variable A = 0 if necessary! sand has to be a clear edge and use in a foundry mold! une pointe de fleche parametrique difficile a imprimer, Brim a  mort et variable A=0 au besoin ! a poncer pour avoir un tranchant net et a utiliser dans un moule en fonderie ! Instructions open in openscad change value compile & render export as STL use on fondry casting ! //parametric Standart n=3; //number of wings - nombre d'ailette L=50; //lenght top to bottom - longueur de la pointe a la base l=20; //largeur d'une ailette E=3 ; //thickness wings - epaisseur a la base de l'aillette D=4; //interne tube diametre - diametre du tube interieur ferule //Hole hole="yes"; //"yes" or "no" hole d=6.66; //Hole Diametre // arrowbility!! A=10; //arrawbility !! 0 for noob printer !, negative for the furious ! $fa=2; $fs=0.01; //1 aile module aile(){ if(hole=="yes"){ difference(){ polyhedron( points=[[0,0,0],[l,0,L],[0,-E/2,L-A],[0,E/2,L-A]], faces=[[2,1,0],[3,2,0],[3,0,1],[1,2,3]] ); translate([l/2.33,E,L/1.33]) rotate([90,0,0])cylinder(r=d/2,h=2*E); } } else{ polyhedron( points=[[0,0,0],[l,0,L],[0,-E/2,L-A],[0,E/2,L-A]], faces=[[2,1,0],[3,2,0],[3,0,1],[1,2,3]] ); } } //n aile module fleche(){ for (i=[1:n]){ rotate([0,0,i*(360/n)])aile(); } } //tube centrale module tube(){ translate([0,0,L/2])cylinder (r=D/2+0.75, h=L/2); translate([0,0,L/5])cylinder(d1=0,r2=D/2+0.75,h=L/2-L/5); } // module principal translate([0,0,L]) rotate([180,0,0]) difference(){ union(){ fleche(); tube(); } translate([0,0,L/2+3]) cylinder (r=D/2, h=L); }