mounting beam

3dprint/beam.json

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+{
+    "fileFormatVersion": "1",
+    "parameterSets": {
+        "New set 1": {
+            "hd": "10",
+            "height": "40",
+            "hole": "3",
+            "radius": "1",
+            "segments": "14",
+            "thickness": "7",
+            "wall": "1.6000000000000001"
+        }
+    }
+}

3dprint/beam.scad

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+$fa=1/1;
+$fs=1/2;
+bissl=1/100;
+wall=1.6;
+hole=3;
+hd=10;
+height=40;
+vd=height-wall;
+segments=14;
+radius=1;
+thickness=7;
+offset=wall/2+hole/2;
+difference() {
+  linear_extrude(thickness, convexity=4) difference() {
+  offset(r=-radius)offset(r=radius)union() {
+    for (i=[0:hd:hd*(segments-1)]) translate ([i,0]) {
+      for (tr=[[[hd,0],[0,0]],[[-hd/2,vd],[0,0]],[[hd/2,vd],[0,0]],[[hd/2,vd],[-hd/2,vd]]]) hull() { //diagonals
+        translate(tr[0])circle(d=wall);
+        translate(tr[1]) circle(d=wall);
+      }
+      for (tr=[[hd/2,vd-offset],[-hd/2,vd-offset],[hd,offset],[0,offset]]) translate(tr)circle(d=2*wall+hole); //big circles
+    }
+    for (tr=[[[-hd/2-offset,0],[0,0]],[[-hd/2-offset,0],[-hd/2-offset,vd]],[[-hd/2-offset,vd],[-hd/2,vd]]]) hull() {//left
+      translate(tr[0])circle(d=wall);
+      translate(tr[1]) circle(d=wall);
+    }
+hull() for (tr=[[0,0],[-hd/2-offset,0],[-hd/2-offset,vd],[-hd/2,vd]]) translate(tr) circle(d=wall); //solid triangle
+    for (tr=[[[hd*segments+offset,0],[0,0]],[[hd*segments+offset,0],[hd*segments+offset,vd]],[[hd*segments+offset,vd],[hd*(segments-0.5),vd]],[[hd*segments,0],[hd*(segments-0.5),vd]]]) hull() { //right
+      translate(tr[0])circle(d=wall);
+      translate(tr[1]) circle(d=wall);
+    }
+  }
+  for (i=[0:segments]) {
+    translate([i*hd,offset]) circle(d=hole);
+    translate([(i-0.5)*hd,vd-offset]) circle(d=hole);
+  }
+  }
+#translate([-hd/2-offset-wall/2,height/4-wall,thickness/2])rotate([0,90,0])cylinder(d=hole,h=hd-wall);
+#translate([-hd/2-offset-wall/2,height/2-wall/2,thickness/2])rotate([0,90,0])cylinder(d=hole,h=hd-wall);
+#translate([-hd/2-offset-wall/2,height*3/4,thickness/2])rotate([0,90,0])cylinder(d=hole,h=hd-wall);
+}