rebuilt optimized SCAD for rpi-zero-frame.scad, regen rpi-zero-frame.stl

Printed-Parts/SCAD/rpi-zero-frame.scad

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+// [email protected] pi zero frame for Einsy RAMBo 2020-07-18
+
+// b/c Prusa's SCAD is MIA
+// re: https://github.com/prusa3d/Original-Prusa-i3/issues/132
+
+// dimensions are derrived from the original STL, with some cleanup
+//color("red") translate([0,pizd[1],0]) translate([3.5,-3.5,4.5]) import("rpi-zero-frame.stl");
+
+// pi zero dimensions
+pizd=[65,30,4];
+
+// pin shroud thickness
+pinz=2.5;
+
+// pin clearance
+pc=1.8;
+
+// part thickness
+pt=2;
+
+// pcb thickness
+pcbt=1.4;
+
+inch=25.4;
+
+// f'n around
+$fn=32;
+
+
+final_part();
+module final_part(){
+    difference(){
+        base();
+        pins_cut();
+        hdmi_cut();
+        usb_cut();
+        inductor_cut();
+        weight_loss();
+        //mounting_fasteners();
+        under_cuts();
+        nice_cut();
+    }
+}
+
+module base(){
+    // inset for "shrunk" outer dims, matching OEM.
+    translate([0.5,0.5,0])
+
+    // base block
+    cheese_slice(pizd[0]-1,pizd[1]-1,pt,6);
+
+    // support columns & pegs
+    translate([3.5,3.5,0]){
+        for(x=[0:58:58]){
+            for(y=[0:23:23]){
+                // peg
+                translate([x,y,0]) cylinder(d=2.70, h=pt+pinz+pcbt);
+                // column
+                translate([x,y,0]) cylinder(d=6, h=pt+pinz);
+            }
+        }
+    }
+
+    // braces around gpio pins
+    arm_rests();
+
+    // this isn't really needed, but it's on the OEM frame.
+    arm_rest_flap();
+
+    // support flap for SD Card side under cuts
+    // could be shorter to save a little material
+    hull(){
+        translate([3.5,3.5,pt]) cylinder(d=6,h=pinz-1.5);
+        translate([3.5,pizd[1]-3.5,pt]) cylinder(d=6,h=pinz-1.5);
+    }
+
+    // support flap for camera connector side
+    // could also be shorter to save a little material
+    hull(){
+        translate([pizd[0]-3.5,0.5+3,pt]) cylinder(d=6,h=pinz-1.2);
+        translate([pizd[0]-3.5,pizd[1]-3.5,pt]) cylinder(d=6,h=pinz-1.2);
+    }
+
+    // extension above USB power connector to prevent shorting.
+    usb_flap();
+}
+
+module nice_cut(){
+    // it bugged me, so I fixed it.
+    translate([3.5,3.5+pizd[1]-7,pt-4.4+pinz+1])
+    difference(){
+        translate([-3,0,0]) cube([6,6,10]);
+        cylinder(d=6,h=10);
+    }
+}
+
+module pins_cut(){
+    // all the pins
+//    translate([(pizd[0]-inch*2)/2,3.5-(inch*.05),0])
+//    for(x=[0:inch*.1:inch*2]){
+//        for(y=[0:inch*.1:inch*.1]){
+//            translate([x,y,0]) cylinder(d=1,h=20);
+//        }
+//    }
+
+    // first four
+    translate([(pizd[0]-inch*2)/2+inch*.05,3.5-(inch*.05),0])
+    for(x=[inch*.1:inch*.1:inch*.4]){
+        for(y=[0:inch*.1:0]){
+            translate([x,y,0]) cylinder(d=1.6,h=20);
+        }
+    }
+    // other two
+    translate([(pizd[0]-inch*2)/2+inch*.05,3.5-(inch*.05),0])
+    for(x=[inch*.7:inch*.1:inch*.7]){
+        for(y=[0:inch*.1:inch*.1]){
+            translate([x,y,0]) cylinder(d=1.6,h=20);
+        }
+    }
+}
+
+module inductor_cut(){
+    translate([pizd[0]-5-6.5+2,10.5,pt+1.3-.6]) cheese_slice(5,5,.6,2);
+}
+
+module hdmi_cut(){
+    translate([6.5,pizd[1]-8,pt-4.4+pinz+1]) cube([12,8,4.4]);
+}
+
+module usb_flap(){
+    translate([47.7+1+3,pizd[1]-2.5,0]) cheese_slice(6,4,pt+.4,2);
+}
+
+module usb_cut(){
+    //translate([47.7-10,pizd[1]-5.5,pt+pinz+1.6-4]) cube([20,7,4]);
+    translate([47.7-10,pizd[1]-5.5,pt+pinz+1.6-4]) 
+    cheese_slice(20,7,4,1);
+
+    // nice edge for usb flange
+    translate([48.5,pizd[1]-2.5+4,1.5]) rotate([45,0,0]) cube(10);
+}
+
+module weight_loss(){
+    translate([6.5,6.5,0]) cube(pizd-[13,13,0]+[0,0,10]);
+}
+
+module under_cuts(){
+    // sorry for the translate wrap, I manually shifted the geometry against
+    // the abandoned rpi-zero-frame.stl.    
+    translate([0,pizd[1],0]){
+        // under usb power input
+        hull(){
+            translate([54.7,-4.3,0]) twoby();
+            translate([54.7,-4.3+inch*.2,0]) twoby();
+        }
+
+        // beside usb power input
+        translate([54.7-inch*.25,-4.3-inch*.1,0]) twoby();
+
+        // straddle cut on gpio side
+        translate([34,-26,0]){
+            hull(){
+                twoby();
+                translate([inch*.4,0,0]) twoby();
+            }
+        }
+
+        // straddle cut above sd card slot
+        translate([0,-8.4,0]) twoby();
+
+        // through cut under sd card slot
+        hull(){
+            translate([2.3-inch*.1,-21,0]) twoby();
+            translate([2.3+inch*.2,-21,0]) twoby();
+        }
+
+        // through cut gpio side
+        hull(){
+            translate([52.7,-26.3-inch*.2,0]) rotate([0,0,-90]) twoby();
+            translate([52.7,-26.3+inch*.2,0]) rotate([0,0,-90]) twoby();
+        }
+
+        // corner cut (supports here)
+        hull(){
+            translate([3.6,-30.3,0]) twoby();
+            translate([3.6-inch*.1,-30.3,0]) twoby();
+        }
+    } // end translate
+}
+
+module twoby(){
+    // seemed like a good idea, got the job done
+    hull(){
+        cylinder(d=2.5,h=pc);
+        translate([0,inch*.1,0]) cylinder(d=2.5,h=pc);
+    }
+}
+
+module mounting_fasteners(){
+    translate([3.5,(pizd[1]-10)/2,0])
+    for(x=[0:58:58]){
+        for(y=[0:10:10]){
+            translate([x,y,0]) screw_hole();
+        }
+    }
+}
+
+module screw_hole(){
+    translate([0,0,2]) cylinder(d=6,h=pt);
+    cylinder(d=3,h=pt);
+}
+
+module arm_rests(){
+    // long side from camera side
+    hull(){
+        translate([0.5+pizd[0]-33-3.5,0.5,pt]) cheese_slice(33,6,pinz,3);
+        translate([0.5+pizd[0]-33/2-3.5,0.5,pt]) cube([33/2,6,pinz]);
+        translate([pizd[0]-3.5,0.5+3,pt]) cylinder(d=6,h=pinz);
+    }
+
+    // short side from sd card slot side
+    hull(){
+        translate([0.5+3.5+2,0.5,pt]) cheese_slice(inch*.1,6,pinz,3);
+        translate([0.5+3.5,0.5,pt]) cube([inch*.1/2,6,pinz]);
+        translate([3.5,0.5+3,pt]) cylinder(d=6,h=pinz);
+    }
+}
+
+module arm_rest_flap(){
+    hull(){
+        translate([0.5+pizd[0]-36.5-3.5,0.5+pizd[1]-7,pt]) cheese_slice(33,6,.4,1);
+        translate([0.5+pizd[0]-36.5/2-3.5,0.5+pizd[1]-7,pt]) cube([33/2,6,.4]);
+        translate([pizd[0]-3.5,0.5+3+pizd[1]-7,pt]) cylinder(d=6,h=.4);
+    }
+
+    // stand
+    translate([26.5-1,pizd[1]-3.5-1,pt]) cheese_slice(3,4,pinz,1);
+}
+
+module cheese_slice(width,depth,height,radius){
+    hull(){
+        for(x=[0:width-radius:width-radius]){
+            for(y=[0:depth-radius:depth-radius]){
+                translate([x,y,0]+[radius,radius]/2) cylinder(d=radius, h=height);
+            }
+        }
+    }
+}