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+layer_height=.2; extrusion_width=.5;
+epsilon=.01;
+
+use <pushfittery.scad>;
+include <pushfit_data.scad>;
+
+module multimixer(
+ filament_d = 1.75,
+ liner_od = 4, liner_id = 2,
+ angle = 15, // to the vertical (output) axis
+ inputs = 4,
+ minshell = 2*extrusion_width,
+ shell = 5*extrusion_width,
+ pf = pushfit_embeddest,
+ debug = true
+) {
+ fnd = 4*PI; fnr = 2*fnd;
+
+ pushfit_d = pf_d(pf);
+ pushfit_h = pf_h(pf);
+
+ angular_step = 360/inputs;
+ inputogon_angle = 180*(inputs-2)/inputs;
+
+ sinsin = sin(angle)*sin(angular_step/2);
+ function l_to(d) = d*cos(asin(sinsin))/sinsin;
+ l_output = liner_od;
+ l_input = l_to(pushfit_d/2+minshell);
+ l_fork = l_to(liner_id/2);
+ l_narrow = l_to(liner_od/2+minshell);
+
+ module forinputs() {
+ for(zr=[0:angular_step:359]) rotate([0,0,zr]) rotate([0,angle,0]) children();
+ }//forinputs module
+ module foroutput() {
+ rotate([180,0,0]) children();
+ }
+
+ //translate([pf_d(pf)/2+shell,0,0])
+ //translate([0,0,l_output+pushfit_h])
+ difference() {
+ hull() {
+ forinputs()
+ translate([0,0,l_input+pushfit_h]) mirror([0,0,1])
+ cylinder(d=pushfit_d+shell*2,h=epsilon,$fn=pushfit_d*fnd);
+ foroutput()
+ translate([0,0,l_output+pushfit_h]) {
+ cylinder(d=pushfit_d+shell*2,h=epsilon,$fn=pushfit_d*fnd);
+ }
+ }
+ forinputs() {
+ translate([0,0,l_input]) pushfit(pf);
+ translate([0,0,l_narrow]) {
+ cylinder(d=liner_od,h=l_input+1-l_narrow,$fn=liner_od*fnd);
+ mirror([0,0,1]) translate([0,0,-epsilon])
+ cylinder(d1=(liner_id+liner_od)/2,d2=liner_id,h=liner_id,$fn=liner_od*fnd);
+ }
+ cylinder(d=liner_id,h=l_input+epsilon,$fn=liner_id*fnd);
+ }
+ foroutput() {
+ translate([0,0,l_output]) pushfit(pf);
+ cylinder(d=liner_od,h=l_input+1,$fn=liner_od*fnd);
+ }
+ hull() {
+ forinputs()
+ translate([0,0,l_fork]) cylinder(d=liner_id,h=epsilon,$fn=liner_id*fnd);
+ foroutput()
+ cylinder(d=liner_id,h=epsilon,$fn=liner_id*fnd);
+ }
+ if(debug) {
+ translate([0,0,-20/*TODO:*/])
+ rotate_extrude(angle=angular_step)
+ square([50,100]/*TODO:*/);
+ }
+ }
+
+}
+
+multimixer(debug=true);