21. perfect full caster-standoff

[challenge-bot] / 3d-printables / caster-standoff.scad

diff --git a/3d-printables/caster-standoff.scad b/3d-printables/caster-standoff.scad
index e89b4022cc7d682f06b09b1c73519867381e0c93..322f502be8f33027f49178ea3357dee1aa2f4d0b 100644 (file)
--- a/3d-printables/caster-standoff.scad
+++ b/3d-printables/caster-standoff.scad
@@ -8,17 +8,20 @@
 $fn = 60;
 
 /* measured with calipers */
-ball_diameter = 12.7 + 0.75; // extra bit added for printing imprecision
+ball_diameter = 12.7 + 0.80; // extra bit added for printing imprecision
 ball_radius = ball_diameter / 2;
 
 wall_thickness = 1;
-holder_height = (25 / 32) * ball_diameter + wall_thickness;
+holder_floor = 3;
+holder_arms_length = 10;
+holder_height =
+  holder_floor + holder_arms_length + (11 / 16) * ball_diameter;
 
 holder_radius = ball_radius + wall_thickness;
 holder_diameter = holder_radius * 2;
 
 standoff_radius = holder_radius; // 0.580 / 2 inches from spec sheet
-standoff_height = 48; // eyeballed
+standoff_height = 48 - holder_height; // eyeballed
 
 // eyeballed caster flange height, (0.580/5) inches, times 2 to be stronger
 caster_flange_height = 5;
@@ -58,10 +61,10 @@ module ball_holder(){
   gap = wall_thickness * 4;
   difference (){
     cylinder(r = holder_radius, h = holder_height);
-    translate([0, 0, ball_radius + wall_thickness]){
+    translate([0, 0, ball_radius + holder_floor + holder_arms_length]){
       sphere(r = ball_radius);}
-    translate([0, 0, holder_height / 2 + wall_thickness]){
-      cube([holder_diameter + 0.1, gap, holder_height],
+    translate([0, 0, holder_floor + (holder_height - holder_floor) / 2 + 0.5]){
+      cube([holder_diameter + 0.1, gap, holder_height - holder_floor + 0.1],
            center = true);}}}
 
 module caster_standoff(){