widened belt opening

1 files changed, 5 insertions, 0 deletions

diff --git a/x-carriage.scad b/x-carriage.scad
index 8a9f0d9..c2552d2 100644
--- a/x-carriage.scad
+++ b/x-carriage.scad
@@ -12,24 +12,25 @@ rod_d = 8;
 
         mounting_holes_from_top = [// the offsets of mounting holes on the back
  [0, 20], [-4.5,10], [4.5,10]
 ];
 mounting_holes_apart = mounting_holes_from_top[2][0]-mounting_holes_from_top[1][0];
 
 belt_tooth=0.70;
 belt_thickness=0.75;
 belts_thickness = belt_thickness*2+belt_tooth+0.5;
 belt_width = 6 + slide_tolerance;
 belts_apart = 12;
 belt_pitch = 2;
+beltholder_chamfer = 1;
 
 tiehole_id = bearings_d+3;
 tiehole_od = bearings_d+10;
 tiehole_w = 4;
 
 screw_d = 3;
 screwhead_d = 5.5;
 screwhead_h = 3;
 
 module belt(pitch=belt_pitch,width=belt_width,thickness=belt_thickness,tooth=belt_tooth,l=100,tolerance=0) {
  translate([-l/2,-width/2,-thickness])
  intersection() {
@@ -84,19 +85,23 @@ module xcarriage() {
     hull() for(x=[mounting_holes_apart/2,x1])
      translate([x,0,-r1-bgap])
      rotate([90,0,0]) cylinder(r=r1,h=belt_width+2,center=true,$fn=30);
    }
   } // difference
 
   translate([0,0,30/*heatsink height*//2])
   for(mhft = mounting_holes_from_top) translate([mhft[0],0,-mhft[1]]) {
    rotate([90,0,0]) cylinder(d=screw_d+2*play_tolerance,h=bearings_d+2*bearings_s+2,center=true,$fn=30);
    translate([0,belt_width/2+screwhead_h+play_tolerance,0])
    rotate([90,0,0]) cylinder(d=screwhead_d+2*play_tolerance,h=screwhead_h+play_tolerance+1,$fn=30);
   }
+  ccs = (belt_thickness+2*beltholder_chamfer)/sqrt(2);
+  translate([0,-belt_width/2,belts_apart/2+belt_thickness/2-fit_tolerance/2])
+  rotate([45,0,0]) cube(size=[cw+2,ccs,ccs],center=true);
+
  } // difference
 }
 
 print=false;
 if(print) rotate([-90,0,0]) xcarriage();
 else xcarriage();