another: potentially even prettier pushfit arrangement

1 files changed, 26 insertions, 13 deletions

diff --git a/another.scad b/another.scad
index 6af68b6..4c4af5c 100644
--- a/another.scad
+++ b/another.scad
@@ -31,32 +31,33 @@ module the_extruder(
  knob_bore_l = 4,
  knob_indent_d = 4,
  knob_indents = 12,
  // spring tensioner
  st_nut_d = 9, st_nut_h = 4,
  st_screw_d = 5,
  st_thickshell = 8*extrusion_width, st_thinshell = 4*extrusion_width,
 
  // screw it
  mount_screw_d = 3.1, mount_screw_l = 20,
  mount_screwhead_d=6, mount_screwhead_h=3,
  idler_screw_d = 3,
  idler_screwhead_d=6, idler_screwhead_h=3,
 
  pf = pushfit_embeddest,
  pf_shell = max(3*layer_height,3*extrusion_width),
+ pf_smooth = true,
 
  // empty spaces
  idler_travel = 3,				// how far should idler travel when pressed
  idler_clearance=1,
  pulley_clearance=2,
  lever_v_clearance=.7,				// vertical clearance for the lever
  spring_d_clearance=1,
  protrusion_tolerance_h=.5,			// horizontal tolerance for the motor protrusion
  protrusion_tolerance_v=.5,			// vertical tolerance for the motor protrusion
  mount_screw_d_tolerance=.4,
  idler_v_tolerance=.5,
  knob_bore_d_tolerance=.6,
  st_nut_h_tolerance=.2,
  st_nut_d_tolerance=.2,/* TODO: make it st_nut_w_tolerance */
  st_screw_d_tolerance=.3,
 
@@ -235,46 +236,58 @@ module the_extruder(
 	hf = (bigd-st_screw_d-st_screw_d_tolerance)/2;
 	translate([0,0,st_thickshell+st_nut_h+st_nut_h_tolerance+st_thinshell-epsilon])
 	cylinder(d1=st_screw_d+st_screw_d_tolerance,d2=bigd,
 	 h=hf+epsilon, $fn=fnd*bigd);
 	translate([0,0,st_thickshell+st_nut_h+st_nut_h_tolerance+st_thinshell+hf-epsilon])
 	cylinder(d=bigd,h=fsw+1,$fn=fnd*bigd);
        }
       }
      }
     } // translate
     
     // pushfit bracket
     translate([0,0,filament_elevation])
     rotate([0,0,45]) translate([pulley_d/2,0,0])
     rotate([-90,0,0])
     translate([0,0,mount_d/sqrt(2)/2+mount_screw_d-gearbox_d/2/*TODO:*/]) {
-     pfb2a = pf_d(pf)+2*pf_shell; pfba = pfb2a/2;
-     pfbd = pfb2a/cos(30);
-     pfbs = pfb2a*tan(30);
-     pfbl = pf_h(pf)+gearbox_d/2/*TODO:*/;
-     cylinder(d=pfbd,h=pfbl,$fn=6);
-     translate([-pfbs/2,0,0]) {
+     pfbl = pf_h(pf)+gearbox_d/2; //TODO:
+     if(pf_smooth) {
+      pfbd = pf_d(pf)+2*pf_shell;
       hull() {
-       translate([0,-pfba,0]) cube(size=[pfbs,pfb2a,pfbl]);
-       cube(size=[pfbs,filament_elevation,pfbl-filament_elevation+pfba]);
-       mirror([0,1,0])
-       cube(size=[pfbs,body_h-filament_elevation,pfbl-body_h+filament_elevation+pfba]);
-      }
-     }
-    }
+       cylinder(d=pfbd,h=pfbl,$fn=pfbd*fnd);
+       translate([-epsilon/2,0,0]) {
+        cube(size=[epsilon,filament_elevation,pfbl-filament_elevation+pfbd/2]);
+        mirror([0,1,0])
+        cube(size=[epsilon,body_h-filament_elevation,pfbl-body_h+filament_elevation+pfbd/2]);
+       }//translate
+      }//hull
+     }else{
+      pfb2a = pf_d(pf)+2*pf_shell; pfba = pfb2a/2;
+      pfbd = pfb2a/cos(30);
+      pfbs = pfb2a*tan(30);
+      cylinder(d=pfbd,h=pfbl,$fn=6);
+      translate([-pfbs/2,0,0]) {
+       hull() {
+        translate([0,-pfba,0]) cube(size=[pfbs,pfb2a,pfbl]);
+        cube(size=[pfbs,filament_elevation,pfbl-filament_elevation+pfba]);
+        mirror([0,1,0])
+        cube(size=[pfbs,body_h-filament_elevation,pfbl-body_h+filament_elevation+pfba]);
+       }//hull
+      }//translate*/
+     }//if(pf_smooth)
+    }//translate rotate translate rotate translate
    }//union (first child of difference)
 
    // protrusion
    translate([0,0,-1])
    cylinder(d=protrusion_d+protrusion_tolerance_h,h=protrusion_h+protrusion_tolerance_v+1,$fn=fnd*(protrusion_d+protrusion_tolerance_h));
    // mount screw holes
    for(zr=[0:90:359]) rotate([0,0,zr]) translate([mount_d/2,0,0]) {
     translate([0,0,mount_screw_l-mounthole_depth/2-(bridges?layer_height:-epsilon)])
     mirror([0,0,1])
     cylinder(d=mount_screw_d+mount_screw_d_tolerance,
              h=mount_screw_l-mounthole_depth/2+1,
 	     $fn=fnd*(mount_screw_d+mount_screw_d_tolerance));
     translate([0,0,mount_screw_l-mounthole_depth/2])
     cylinder(d=mount_screwhead_d,h=body_h+1,$fn=fnd*mount_screwhead_d);
    }//for
    // pushfit