From 97b0bb7fbaefc5fc692a563c1a7218dfd0ce0839 Mon Sep 17 00:00:00 2001
From: TQ Hirsch <thequux@thequux.com>
Date: Sun, 6 Mar 2022 18:05:36 +0100
Subject: [PATCH] added configuration for screwhole expansion, deepened
 screwholes for idler posts

---
 TODO.md        |  2 --
 constants.scad |  6 +++--
 parts.scad     | 59 ++++++++++++++++++++++++++------------------------
 3 files changed, 35 insertions(+), 32 deletions(-)

diff --git a/TODO.md b/TODO.md
index 46a2320..c982146 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,9 +1,7 @@
 ## Mechanical
 
-* Add screw holes for feet in each corner
 * Add place to mount electronics (likely just an extra part)
 * add slot for motor electronic connection
-* Add screw holes for idler mounts in rear corner
 * Raise motor mount on front left motor
 
 ## Electronics
diff --git a/constants.scad b/constants.scad
index 188d3ee..78139bd 100644
--- a/constants.scad
+++ b/constants.scad
@@ -14,5 +14,7 @@ cur_ypos = 140;
 
 echo(str("Range = ", [ xsize - xmin * 2, ysize - ymin * 2 ]));
 
-$fn = 30;
-$include_substock = true;
+//$fn = 30;
+
+screw_hole_expansion = 1.1;
+screw_num_sides = 7;
\ No newline at end of file
diff --git a/parts.scad b/parts.scad
index 0ac5853..db88d72 100644
--- a/parts.scad
+++ b/parts.scad
@@ -65,12 +65,12 @@ module corner_base(extension = wall_thickness) {
       translate([pos + actual_corner_offset, 0, -odim])
       union() {
         cylinder(d = 8, h=2, center=true);
-        cylinder(d = 5, h = odim);
+        cylinder(d = 5 * screw_hole_expansion, h = odim);
       }
     }
 
     // Adjustable feet
-    cylinder(d=8, h=odim * 2 + 1);
+    cylinder(d=8, h=odim * 2 + 1, $fn = screw_num_sides);
   }
 }
 
@@ -172,29 +172,24 @@ module nema17_housing() {
 
   screw_dxy = 31 / 2;
 
-  translate([ 0, -nema17_face / 2 - frame_size / 2 - wall_thickness, 0 ])
-      slotify([0, -motor_mount_length_adjustment, 0]) {
-
-    translate([ 0, 0, -2 ])
+  translate([ 0, -nema17_face / 2 - frame_size / 2 - wall_thickness, 0 ]) {
+    slotify([0, - motor_mount_length_adjustment, 0]) {
+      translate([ 0, 0, -2 ])
         cube([ nema17_face + 1, nema17_face + 1, hdepth ], center = true);
-    cylinder(d = 23, frame_size);
+      cylinder(d = 23, frame_size);
+    }
+    for (x = [-1, 1], y = [-1,1]) {
+      slotify([0, - motor_mount_length_adjustment, 0])
+      translate([
+          x * screw_dxy,
+          y * screw_dxy,
+              frame_size / 2 + wall_thickness + 0.5
+        ])
+        rotate([ 180, 0, 0 ]) {
+          cylinder(d = 5 * screw_hole_expansion, h = wall_thickness + 1);
+        }
+    }
 
-    translate([ -screw_dxy, -screw_dxy, frame_size / 2 + wall_thickness ])
-        rotate([ 180, 0, 0 ]) {
-      cylinder(d = 5, h = 3);
-    }
-    translate([  screw_dxy, -screw_dxy, frame_size / 2 + wall_thickness ])
-        rotate([ 180, 0, 0 ]) {
-      cylinder(d = 5, h = 3);
-    }
-    translate([ -screw_dxy,  screw_dxy, frame_size / 2 + wall_thickness ])
-        rotate([ 180, 0, 0 ]) {
-      cylinder(d = 5, h = 3);
-    }
-    translate([  screw_dxy,  screw_dxy, frame_size / 2 + wall_thickness ])
-        rotate([ 180, 0, 0 ]) {
-      cylinder(d = 5, h = 3);
-    }
   }
 }
 
@@ -227,7 +222,7 @@ module idler_post(belt_height, toothed = true) {
           cube([ post_radius * 2, post_radius * 2, slot_height ]);
     }
 
-    cylinder(d = 3, h = total_height + 1, $fn = 30);
+    cylinder(d = 3, h = total_height + 1);
     translate([ 0, 0, total_height - 2 ]) cylinder(r = 3, h = 3);
   }
   if($preview) {
@@ -304,10 +299,18 @@ module frcorner() {
 
 module blcorner() {
   bom_item();
-  union()
-  rotate([ 0, 0, 270 ]) {
-    corner_base(extension = rail_holder_width);
-    rail_holder(true);
+  difference() {
+    rotate([0, 0, 270]) {
+      corner_base(extension = rail_holder_width);
+      rail_holder(true);
+    }
+    for (pos = [
+        [motor_shaft_xoffset + pulley_sbend_offset, 0, 0],
+        [0, motor_shaft_xoffset + pulley_sbend_offset, 0],
+      ]) {
+      translate(pos)
+      cylinder(d = 3, h = belt_height2, $fn=screw_num_sides);
+    }
   }
   translate([motor_shaft_xoffset + pulley_sbend_offset, 0, 0])
   rotate([0,0,-90])