cutout on the back side

in the unfortunate event of filament grinding it may serve as an
escape way for filament powder

1 files changed, 13 insertions, 0 deletions

diff --git a/another.scad b/another.scad
index 4af7d29..38a9aae 100644
--- a/another.scad
+++ b/another.scad
@@ -268,24 +268,37 @@ module the_extruder(
    cylinder(d=idler_d+idler_clearance,h=ls_h,$fn=fnd*(idler_d+idler_clearance));
 
    // idler clearance
    a=cos(45)*(pulley_d+idler_d)/2;
    b=mount_d/2-a;
    x=sqrt(pow(a,2)+pow(b,2));
    translate([mount_d/2,0,ls_z])
    intersection() {
     r = x+idler_d/2+idler_clearance;
     cylinder(r=r,h=ls_h,center=true);
     translate([-r-1,0,-ls_h/2-1]) cube(size=[2*r+2,r+1,ls_h+2]);
    }
+
+   // back side cutout
+   a0 = asin((mount_screwhead_d+2*extrusion_width)/mount_d);
+   a1 = atan((longwing-lever_thickness/2)/(gearbox_d/2));
+   translate([0,0,ls_z]) hull() {
+    rotate([0,0,-180+a0])
+    rotate_extrude(angle=a1-a0)
+    translate([0,-ls_h/2])
+    square([sqrt(pow(gearbox_d/2,2)+pow(longwing-lever_thickness/2,2))+1,
+            ls_h]);
+    cylinder(d=bore_d/2/*TODO:recalculate angles based on this,
+                         too lazy to do that now*/,
+             h=ls_h,center=true);
    }
    
    rotate([0,0,-45])
    translate([0,0,ls_z-ls_h/2])
    cube(size=[gearbox_d,gearbox_d,lever_thickness+lever_v_clearance]);
    translate([0,0,ls_z-ls_h/2]) {
     translate([mount_screwhead_d/2,0,0])
     mirror([0,1,0])
     cube(size=[gearbox_d,gearbox_d/2+1,lever_thickness+lever_v_clearance]);
    }
    //translate([-mount_d/2,-longwing,filament_elevation])
    if(!tensioner) /* XXX: this seems to be bullshit, but it's so old, that it's historical bullshit */