make offset on idler and pulley side difference

idler is moving and as long as I'm using plain bearing for idler
that should be better

1 files changed, 13 insertions, 8 deletions

diff --git a/another.scad b/another.scad
index a93d21a..50b3a84 100644
--- a/another.scad
+++ b/another.scad
@@ -26,184 +26,189 @@ module the_extruder(
  // filament path properties
  filament_d = 1.75,
  filament_path_d = 2,
          filament_guide_d = 4,                  // PTFE filament guide diameter
  // knob properties
  knob_h = 10,
  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=.5,
 
  what="lever",  // lever|body|knob|springpad|*
  left=false,
  vitamins = true,
  supports = false, bridges = true,
  tensioner = true,
  debug = false
 ) {
  fnd = 2*PI; fnr = 2*fnd;
 
+ idler_filament_offset = filament_path_d/2; // -filament_offset;
  lever_shell = mount_screwhead_h+0.5;
  lever_thickness=max(spring_d+spring_d_clearance+layer_height*8,idler_h+idler_v_tolerance+2*lever_shell);
  lsd = idler_d-idler_clearance*2;
  longwing=gearbox_d/2+spring_d/2+lsd/2;
  h_ = (pulley_d+idler_d)/(2*sqrt(2));
  ri = sqrt( pow(h_,2) + pow(mount_d/2-h_,2) );
  spring_dl = idler_travel*longwing/ri;
 
  filament_elevation=protrusion_h+pulley_elevation+teeth_elevation;
  ls_z = filament_elevation; // leverspace mid-z
  body_h = max(protrusion_h+bore_l,mount_screw_l-mounthole_depth/2+mount_screwhead_h,ls_z*2);
  ls_h = lever_thickness+lever_v_clearance; // leverspace height
 
  module mirrorleft() {
   mirror([left?0:1,0,0]) children();
  }
  module place_idler() {
   rotate([0,0,45])
   translate([(pulley_d+idler_d)/2,0,0])
   children();
  }
  module finger_indent(d=lever_thickness,depth/*=1*/,r/*=15*/) {
   if(depth) {
    hh = (-4*pow(depth,2)+pow(d,2))/(8*depth);
    rr = depth+hh;
    translate([0,0,hh]) sphere(r=rr,$fn=fnr*rr);
   }else if(r) {
    hh=sqrt(pow(r,2)-pow(d,2)/4);
    translate([0,0,hh]) sphere(r=r,$fn=fnr*r);
   }
  }
 
  % if(vitamins) mirrorleft() {
   translate([0,0,-epsilon]) mirror([0,0,1]) cylinder(d=gearbox_d,h=1,$fn=60);
   for(zr=[0:90:359]) rotate([0,0,zr]) translate([mount_d/2,0,0])
    cylinder(d=mount_screw_d,h=20,$fn=30);
   translate([0,0,-epsilon]) cylinder(d=protrusion_d,h=protrusion_h,$fn=30);
   translate([0,0,protrusion_h]) {
    difference() {
     cylinder(d=bore_d,h=bore_l,$fn=30);
     translate([-bore_d/2-1,bore_dd-bore_d/2,-1])
     cube([bore_d+2,bore_d/2,bore_l+2]);
    }
    translate([0,0,pulley_elevation]) {
     cylinder(d=pulley_d,h=pulley_h,$fn=30);
     translate([0,0,teeth_elevation]) {
      place_idler() {
       cylinder(d=idler_d,h=idler_h,center=true,$fn=30);
       cylinder(d=idler_screw_d,h=lever_thickness+2,center=true,$fn=30);
      }//place idler
      // filament path
-     rotate([0,0,45]) translate([pulley_d/2+filament_offset,0,0]) {
-      rotate([90,0,0]) cylinder(d=filament_d,h=gearbox_d*2,center=true,$fn=15);
-      rotate([-90,0,0])
-      translate([0,0,mount_d/sqrt(2)/2+mount_screw_d])
-      pushfit(pf);
-     }
+     rotate([0,0,45]) {
+      translate([pulley_d/2-idler_filament_offset,0,0]) rotate([90,0,0]) {
+       cylinder(d=filament_d,h=gearbox_d,center=false,$fn=15);
+      }//rotate translate
+      translate([pulley_d/2+filament_offset,0,0]) rotate([-90,0,0]) {
+       cylinder(d=filament_d,h=gearbox_d,center=false,$fn=15);
+       translate([0,0,mount_d/sqrt(2)/2+mount_screw_d])
+       pushfit(pf);
+      }//rotate translate
+     }//rotate
     }//translate teeth
    }//translate pulley
   }//translate protrusion
  }//vitamins
 
  module lever() {
   translate([0,0,protrusion_h+pulley_elevation+teeth_elevation]) {
    difference() {
     union() {
      hull() {
       place_idler()
       cylinder(d=lsd,h=lever_thickness,center=true,$fn=60);
       translate([mount_d/2,0,0])
       cylinder(d=lsd,h=lever_thickness,center=true,$fn=60);
      }//hull
      hull() {
       translate([mount_d/2,0,0])
       cylinder(d=lsd,h=lever_thickness,center=true,$fn=60);
       translate([mount_d/2,-longwing,0]) rotate([0,90,0])
       cylinder(d=lever_thickness,h=lsd,center=true,$fn=60);
      }//hull
     }//union
  
     // filament path
     place_idler() {
-     translate([-idler_d/2+filament_offset,0,0]) rotate([90,0,0]) {
+     translate([-idler_d/2-idler_filament_offset,0,0]) rotate([90,0,0]) {
       cylinder(d=filament_path_d,h=3*gearbox_d,center=true,$fn=30);
       translate([0,-filament_path_d/2/sqrt(2),0]) rotate([0,0,45])
       cube(size=[filament_path_d/2,filament_path_d/2,3*gearbox_d],center=true);
      }//rotate translate
-     translate([-idler_d/2+filament_offset,0,0])
+     translate([-idler_d/2-idler_filament_offset,0,0])
      rotate([90,0,0])
      translate([0,0,
       sqrt(2)*(mount_d-pulley_d+lsd)/2
      ]) {
       cylinder(d1=filament_path_d,d2=2*filament_path_d,
                h=filament_path_d,$fn=2*filament_path_d*fnd);
       translate([0,0,filament_path_d-epsilon])
       cylinder(d=2*filament_path_d,h=lsd,$fn=2*filament_path_d*fnd);
      }
     }//place_idler
     
     // idler space and mounting hole
     place_idler() {
      difference() {
       cylinder(d=idler_d+idler_clearance*2,h=idler_h+idler_v_tolerance,center=true,$fn=60);
       if(supports) for(y=[-lsd/2+extrusion_width:(lsd-2*extrusion_width)/3:lsd/2-extrusion_width])
        translate([-lsd/2-1,y-extrusion_width/2,-idler_h/2-idler_v_tolerance/2-1])
        cube(size=[lsd+2,extrusion_width,idler_h+idler_v_tolerance+2]);
      }
      cylinder(d=idler_screw_d,h=lever_thickness+2,center=true,$fn=30);
      translate([0,0,lever_thickness/2-idler_screwhead_h])
      cylinder(d=idler_screwhead_d,h=idler_screwhead_h+1,$fn=fnd*idler_screwhead_d);
     }
     // mounting screw hole
     translate([mount_d/2,0,0])
     cylinder(d=mount_screw_d+mount_screw_d_tolerance,h=lever_thickness+2,center=true,$fn=fnd*mount_screw_d);
     
     // lever end
     translate([mount_d/2,0,0]) rotate([0,90,0]) {
      translate([0,-longwing,lsd/2]) finger_indent(d=lever_thickness-1,r=15);
      translate([0,-longwing,0])
      mirror([0,0,1])
      difference() {
       cylinder(d=spring_d+spring_d_clearance,h=lsd,$fn=fnd*(spring_d+spring_d_clearance));
       sphere(d=spring_d*3/4,$fn=fnd*spring_d*3/4);
      }
     }//rotate-translate
    }//difference
    // bridging patch
    if(bridges) place_idler()
    translate([0,0,lever_thickness/2-mount_screwhead_h])
    mirror([0,0,1])
    cylinder(d=mount_screwhead_d,h=layer_height);
   }//translate
  }//lever module
  
  module body() {
   difference() {