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+s=2; /* shell thickness */
+defaultvolume=20*10*20; /* volume for testing */
+
+/* side of the cube, containing half the volume */
+function mixing_hvs(volume=defaultvolume) = pow(volume/2,1/3);
+/* vessel dimensions */
+function mixing_size(volume=defaultvolume) = let(hvs = mixing_hvs(volume=volume)) [2*hvs+3*s,hvs+2*s,hvs+2*s];
+
+module mixing(
+ volume=defaultvolume, /* volume in cubic mm */
+ what="altogethernow" /* vessel|splitter|altogethernow */
+) {
+ g=1; /* guide diameter */
+ hvs = mixing_hvs(volume=volume);
+ if(what=="vessel") {
+ sz = mixing_size(volume=volume);
+ translate([-sz[0]/2,-sz[1]/2,0]) difference() {
+ cube(size=sz);
+ translate([s,s,s])
+ cube(size=[2*hvs+s,hvs,hvs+s+1]);
+ }
+ for(mx=[0,1]) mirror([mx,0,0]) {
+ // horizontal guide
+ translate([s/2+g/2,0,s]) rotate([90,0,0]) cylinder(d=g,h=hvs+s,center=true,$fn=12);
+ for(my=[0,1]) mirror([0,my,0]) {
+ // vertical guide + crowning sphere
+ translate([s/2+g/2,hvs/2,0]) {
+ cylinder(d=g,h=hvs+2*s-g/2,$fn=12);
+ translate([0,0,s+hvs+s-g/2]) sphere(d=g,$fn=12);
+ }
+ }
+ // level
+ translate([0,0,s+hvs]) {
+ translate([s/2+hvs,0,0]) rotate([90,0,0]) cylinder(d=g,h=hvs+s,center=true,$fn=12);
+ for(my=[0,1]) mirror([0,my,0]) {
+ translate([s/2+g/2,hvs/2,0]) rotate([0,90,0]) cylinder(d=g,h=hvs-g/2+s/2,$fn=12);
+ }
+ }
+ }
+ }else if(what=="splitter") {
+ hull() {
+ translate([-s/2,-hvs/2,0]) cube(size=[s,hvs,hvs+2*s]);
+ cd=hvs/2;
+ for(yz=[ [0,2*hvs], [-hvs/2+cd/2,hvs+2*s], [hvs/2-cd/2,hvs+2*s] ])
+ translate([0,yz[0],yz[1]])
+ rotate([0,90,0]) cylinder(d=cd,h=s,$fn=60,center=true);
+ }
+ translate([0,0,2*hvs]) sphere(d=2*s,$fn=30);
+ }else if(what=="altogethernow") {
+ mixing(volume=volume,what="vessel");
+ translate([0,0,s]) mixing(volume=volume,what="splitter");
+ }
+}
+
+color("salmon",0.7) mixing(what="altogethernow");
+/* vim:set ai sw=1: */