Removed unneeded calls to render

TODO.md

@@ -4,5 +4,11 @@
 * 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
 
+Must contain:
+* Two TMC2209 drivers
+* Two 4-pin screw terminals for motors
+* Arduino?

parts.scad

@@ -237,7 +237,7 @@ module idler_post(belt_height, toothed = true) {
 
 module flcorner() {
   bom_item();
-  render() {
+  union() {
     rotate([ 0, 0, 0 ]) {
       corner_base();
       rail_holder(false);
@@ -270,7 +270,7 @@ module flcorner() {
 
 module frcorner() {
   bom_item();
-  render() {
+  union() {
     rotate([ 0, 0, 90 ]) {
       corner_base();
       rail_holder(true);
@@ -304,7 +304,7 @@ module frcorner() {
 
 module blcorner() {
   bom_item();
-  render()
+  union()
   rotate([ 0, 0, 270 ]) {
     corner_base(extension = rail_holder_width);
     rail_holder(true);
@@ -320,7 +320,7 @@ module blcorner() {
 
 module brcorner() {
   bom_item();
-  render()
+  union()
   rotate([ 0, 0, 180 ]) {
     corner_base(extension = rail_holder_width);
     rail_holder(false);
@@ -339,7 +339,7 @@ module xsled_slider() {
   screw_tab_len = 20;
   screw_tab_thickness = 10;
 
-  render()
+  union()
       // translate([screw_tab_len, 0, 0])
       difference() {
     union() {
@@ -517,6 +517,7 @@ module xsled2() {
 
   echo("Ledge width: ", ledge_width - outside_ledge_width);
   // rail attachment points
+  render() {
     for (xsign = [1, - 1], ysign = [1, - 1]) {
       translate([sled_xsize / 2 * xsign, sled_ysize / 2 * ysign, 0])
         rotate([0, - 90 * xsign, 0]) {
@@ -532,9 +533,6 @@ module xsled2() {
               cylinder(d = rail_diam * 1.1, h = tab_len + 1);
             }
           }
-        if ($preview) {
-          bushing();
-        }
         }
     }
 
@@ -599,7 +597,16 @@ module xsled2() {
           }
         }
     }
+  }
 
+  if ($preview) {
+    for (xsign = [1, - 1], ysign = [1, - 1]) {
+      translate([sled_xsize / 2 * xsign, sled_ysize / 2 * ysign, 0])
+        rotate([0, - 90 * xsign, 0]) {
+          bushing();
+        }
+    }
+  }
   color("#fff3") if ($preview) {
     // draw glass sheets
     translate(