some hardware design modifications, added endstop mounts.

hardware/config.scad

 y_carriage_post_center = 1;
 y_carriage_post_screw_hole = y_carriage_post_screw + nut_gap;
 y_carriage_post_len = y_carriage_rail_dist - rail_wheel_height / 2 + 10;
+echo("y_carriage_post_len", y_carriage_post_len);
+
+eccentric_height_main = 8.5;
+eccentric_height_inset = 2.4;
+eccentric_dia_inset = 7.3;
+eccentric_dia_main = 11.5;
+eccentric_hole_off = 0.75;
+eccentric_screw_hole = y_carriage_post_screw_hole + 2 * eccentric_hole_off;
+eccentric_height_add = y_carriage_post_len - eccentric_height_main;
+eccentric_inset_wall = 15.0;
+eccentric_inset_hole = eccentric_height_inset + 0.6;
+eccentric_screw_hole_h = 6.5;
+eccentric_screw_hole_dia = 15.0 + 2 * eccentric_hole_off;
+
+use_custom_eccentric = true;
 
 y_carriage_wheel_off_x = 20.4;
 y_carriage_wheel_off_y = 28;
 point_that_reaches_everywhere_x = -7.5;
 point_that_reaches_everywhere_y = -17.5;
 
-use_anim = true;
+use_anim = false;
 x_axis_position = 1.0;
 y_axis_position = 0.5;
 
 right_support_off = 50;
 
 echo("distance between bottom support rails", x_axis_rail_len - left_support_off - right_support_off - 40, -left_support_off, -right_support_off);
+
+endstop_pcb_width = 16.0;
+endstop_pcb_height = 40.0;
+endstop_pcb_depth = 1.6;
+endstop_pcb_hole = 3.2;
+endstop_pcb_hole_dist_x = 3.2;
+endstop_pcb_hole_dist_y = 3.2;
+endstop_pcb_hole_dist = 19.0;
+endstop_pcb_switchpoint = 4.5;
+endstop_mount_width = 12;
+endstop_mount_depth = 5;
+endstop_mount_slot_width = 6;
+endstop_mount_slot_depth = 4;
+endstop_mount_slot_length = 8;
+endstop_mount_add_height = 15;
+endstop_mount_nut_hole = 6.5;
+endstop_pcb_mount_off_h = y_carriage_rail_dist + endstop_pcb_switchpoint + 2; // TODO is now -3
+endstop_pcb_mount_off_d = 18; // TODO was 8
+endstop_pcb_mount_off_w = endstop_mount_slot_length;
+
+use_endstop_mount_v2 = false;

hardware/fuellfix.scad

 use <gearbox.scad>;
 use <common.scad>;
 
-draw_assembly = false;
+draw_assembly = true;
 
 module print() {
     for (i = [1 : 4])
     translate([-real_belt_pulley_dia - i, belt_tensioner_moving_len + 20, 0])
     rotate([0, -90, 0])
     motor_mount(2);
+    
+    for (i = [0, -100])
+    translate([-real_belt_pulley_dia - 140, belt_tensioner_moving_len + i, endstop_mount_depth])
+    rotate([-90, 0, 0])
+    endstop_mount();
 }
 
 top_rail_len = x_axis_rail_len + plate_x - 70;
     fuellfix_assembly();
 } else {
     //belt_pulley(teethcount, real_belt_pulley_dia, 0);
-    x_carriage_holder();
-    //print();
+    //x_carriage_holder();
+    //y_carriage(0);
+    //endstop_mount();
+    
+    print();
 }
     
 echo(); echo(); echo();

hardware/table.scad

  ************** Y-Axis **************
  ************************************/
 
+module endstop_pcb() {
+    difference() {
+        cube([endstop_pcb_width, endstop_pcb_depth, endstop_pcb_height]);
+        
+        for (i = [0, 1])
+        translate([endstop_pcb_hole_dist_x, -1, endstop_pcb_height - endstop_pcb_hole_dist_y - i * endstop_pcb_hole_dist])
+        rotate([-90, 0, 0])
+        cylinder(d = endstop_pcb_hole, h = endstop_pcb_depth + 2);
+    }
+    
+    translate([0, 0, endstop_pcb_height - endstop_pcb_switchpoint])
+    rotate([0, -90, 0])
+    cylinder(d = endstop_pcb_hole, h = endstop_pcb_switchpoint);
+}
+
+module endstop_mount_v1() {
+    %color("yellow")
+    translate([-endstop_pcb_mount_off_w, -endstop_pcb_depth - endstop_pcb_mount_off_d, endstop_pcb_mount_off_h])
+    endstop_pcb();
+    
+    color("blue")
+    difference() {
+        cube([endstop_mount_width, endstop_mount_depth, 40]);
+        
+        for (i = [0, 1])
+        translate([endstop_mount_width / 2, -1, 10 + 20 * i])
+        rotate([-90, 0, 0])
+        cylinder(d = motor_mount_hole_size, h = endstop_mount_depth + 2);
+    }
+    
+    color("blue")
+    difference() {
+        union() {
+            hull() {
+                translate([-endstop_mount_slot_length, 0, 40 - endstop_mount_add_height])
+                cube([endstop_mount_slot_length, endstop_mount_depth, endstop_mount_add_height]);
+                
+                translate([0, 0, endstop_pcb_height - endstop_pcb_hole_dist_y - endstop_pcb_hole_dist])
+                translate([-endstop_pcb_mount_off_w, -endstop_pcb_mount_off_d, endstop_pcb_mount_off_h - endstop_mount_slot_width / 2])
+                cube([endstop_mount_slot_length, endstop_mount_slot_depth, endstop_mount_slot_width]);
+                
+                for (i = [0, 1])
+                translate([0, 0, endstop_pcb_height - endstop_pcb_hole_dist_y - i * endstop_pcb_hole_dist])
+                translate([-endstop_pcb_mount_off_w, -endstop_pcb_mount_off_d, endstop_pcb_mount_off_h - endstop_mount_slot_width / 2])
+                cube([endstop_mount_slot_length, endstop_mount_slot_depth, endstop_mount_slot_width]);
+            }
+        }
+        
+        translate([-endstop_pcb_mount_off_w, -endstop_pcb_depth - endstop_pcb_mount_off_d, endstop_pcb_mount_off_h])
+        for (i = [0, 1])
+        translate([endstop_pcb_hole_dist_x, -1, endstop_pcb_height - endstop_pcb_hole_dist_y - i * endstop_pcb_hole_dist])
+        rotate([-90, 0, 0]) {
+            cylinder(d = endstop_pcb_hole, h = endstop_pcb_depth + 20);
+            
+            translate([0, 0, 1 + endstop_pcb_depth + endstop_mount_slot_depth])
+            cylinder(d = endstop_mount_nut_hole, h = 20, $fn = 6);
+        }
+    }
+}
+
+module endstop_mount_v2() {
+    %color("yellow")
+    translate([-endstop_pcb_mount_off_w, -endstop_pcb_depth - endstop_pcb_mount_off_d, endstop_pcb_mount_off_h])
+    endstop_pcb();
+    
+    color("blue")
+    difference() {
+        cube([endstop_mount_width, endstop_mount_depth, 40]);
+        
+        for (i = [0, 1])
+        translate([endstop_mount_width / 2, -1, 10 + 20 * i])
+        rotate([-90, 0, 0])
+        cylinder(d = motor_mount_hole_size, h = endstop_mount_depth + 2);
+    }
+    
+    color("blue")
+    difference() {
+        union() {
+            hull() {
+                translate([-endstop_mount_slot_length, 0, 40 - endstop_mount_add_height])
+                cube([endstop_mount_slot_length, endstop_mount_depth, endstop_mount_add_height]);
+                
+                translate([0, 0, endstop_pcb_height - endstop_pcb_hole_dist_y - endstop_pcb_hole_dist])
+                translate([-endstop_pcb_mount_off_w, -endstop_pcb_mount_off_d, endstop_pcb_mount_off_h - endstop_mount_slot_width / 2])
+                cube([endstop_mount_slot_length, endstop_mount_slot_depth, endstop_mount_slot_width]);
+            }
+            
+            hull() {
+                for (i = [0, 1])
+                translate([0, 0, endstop_pcb_height - endstop_pcb_hole_dist_y - i * endstop_pcb_hole_dist])
+                translate([-endstop_pcb_mount_off_w, -endstop_pcb_mount_off_d, endstop_pcb_mount_off_h - endstop_mount_slot_width / 2])
+                cube([endstop_mount_slot_length, endstop_mount_slot_depth, endstop_mount_slot_width]);
+            }
+        }
+        
+        translate([-endstop_pcb_mount_off_w, -endstop_pcb_depth - endstop_pcb_mount_off_d, endstop_pcb_mount_off_h])
+        for (i = [0, 1])
+        translate([endstop_pcb_hole_dist_x, -1, endstop_pcb_height - endstop_pcb_hole_dist_y - i * endstop_pcb_hole_dist])
+        rotate([-90, 0, 0]) {
+            cylinder(d = endstop_pcb_hole, h = endstop_pcb_depth + 20);
+            
+            translate([0, 0, 1 + endstop_pcb_depth + endstop_mount_slot_depth])
+            cylinder(d = endstop_mount_nut_hole, h = 20, $fn = 6);
+        }
+    }
+}
+
+module endstop_mount() {
+    if (use_endstop_mount_v2) {
+        endstop_mount_v2();
+    } else {
+        endstop_mount_v1();
+    }
+}
+
 module belt_mount(h) {
     difference() {
         hull() {
     }
 }
 
+module eccentric() {
+    translate([0, 0, eccentric_height_add]) {
+        cylinder(d = eccentric_dia_main, h = eccentric_height_main);
+        
+        translate([0, 0, -eccentric_height_inset])
+        cylinder(d = eccentric_dia_inset, h = eccentric_height_inset);
+    }
+}
+
 module y_carriage_post() {
     rotate([0, 0, 90])
     difference() {
     for (i = [-1, 1])
     for (j = [-1, 1])
     translate([i * y_carriage_wheel_x_dist / 2, j * y_carriage_wheel_y_dist / 2, 0]) {
-        color("blue")
-        y_carriage_post();
+        if (use_custom_eccentric) {
+            color("yellow")
+            eccentric();
         
-        %color("yellow")
-        translate([0, y_carriage_post_hole_off, y_carriage_pulley_off])
-        rail_wheel();
+            %color("yellow")
+            translate([0, eccentric_hole_off, y_carriage_pulley_off])
+            rail_wheel();
+        } else {
+            color("blue")
+            y_carriage_post();
+        
+            %color("yellow")
+            translate([0, y_carriage_post_hole_off, y_carriage_pulley_off])
+            rail_wheel();
+        }
     }
 }
 
     if (axis == 1) {
         echo("t-nut", "x-carriage", "2");
     }
+    
+    if (use_custom_eccentric) {
+        echo("eccentric", "carriage", "4");
+        echo("screw", "carriage", "M5x30", "4");
+        echo("nut", "carriage", "M5", "4");
+    }
 
     color("green")
     difference() {
             translate([0, i * (y_carriage_y + belt_mount_depth) / 2, 0])
             scale([1, -i, 1])
             belt_mount(y_carriage_h);
+            
+            // additional "meat" for eccentric inset
+            translate([y_carriage_x / 2, y_carriage_y / 2, y_carriage_h])
+            for (i = [-1, 1])
+            for (j = [-1, 1])
+            translate([i * y_carriage_wheel_x_dist / 2, j * y_carriage_wheel_y_dist / 2, 0])
+            if (use_custom_eccentric)
+            cylinder(d = eccentric_inset_wall, h = eccentric_height_add);
         }
         
         translate([y_carriage_x / 2, y_carriage_y / 2, 0])
             cylinder(d = y_carriage_post_screw_hole, h = y_carriage_h + 2);
         }
         
+        // holes for wheel posts
         translate([y_carriage_x / 2, y_carriage_y / 2, 0])
         for (i = [-1, 1])
         for (j = [-1, 1])
-        translate([i * y_carriage_wheel_x_dist / 2, j * y_carriage_wheel_y_dist / 2, -1]) {
+        translate([i * y_carriage_wheel_x_dist / 2, j * y_carriage_wheel_y_dist / 2, -1])
+        if (use_custom_eccentric) {
+            cylinder(d = eccentric_screw_hole, h = y_carriage_h + 2);
+            
+            translate([0, 0, y_carriage_h + eccentric_height_add + 1 - eccentric_inset_hole])
+            cylinder(d = eccentric_dia_inset, h = eccentric_inset_hole + 1);
+            
+            cylinder(d = eccentric_screw_hole_dia, h = eccentric_screw_hole_h + 1);
+        } else {
             cylinder(d = y_carriage_post_screw_hole, h = y_carriage_h + 2);
         }
     }
     rotate([180, 0, 0])
     motor_mount(2);
     
+    translate([10 + endstop_mount_depth, y_axis_rail_len - endstop_mount_width, -20])
+    rotate([0, 0, 90])
+    endstop_mount();
+    
     belt_tensioner(2, y_axis_rail_len, 0);
 }
 
     rotate([0, 180, -90])
     y_carriage(1);
     
+    /*
     color("purple")
     for (i = [-1, 1])
     translate([y_carriage_y / 2, 0, 0])
     translate([y_carriage_y / 2 - x_carriage_holder_l, 0, 0])
     translate([0, -x_carriage_holder_w / 2, 20 + y_carriage_h + y_carriage_rail_dist])
     x_carriage_holder();
+    */
 }
 
 module x_axis() {
     rotate([0, 180, 90])
     motor_mount(2);
     
+    translate([x_axis_rail_len - endstop_mount_width, -10 - endstop_mount_depth, -20])
+    endstop_mount();
+    
     rotate([0, 0, -90])
     belt_tensioner(2, x_axis_rail_len, 0);
 }
     assembly_y_axis_plate();
 }
 
+bottom_support_len = 500;
+bottom_support_off = 80;
+
+use_double_supports = false;
+
+module rail_foot() {
+    
+}
+
 module assembly() {
     translate([-x_axis_rail_len / 2, 0, 20]) {
         assembly_x_axis();
         
-        color("grey")
-        for (i = [1, -1])
-        scale([1, i, 1])
-        translate([left_support_off, -left_support_len - 10, -20])
-        rail_2020_y(left_support_len, "left support");
-        
-        color("grey")
-        for (i = [1, -1])
-        scale([1, i, 1])
-        translate([x_axis_rail_len - 20 - right_support_off, -right_support_len - 10, -20])
-        rail_2020_y(right_support_len, "right support");
+        if (use_double_supports) {
+            color("grey")
+            for (i = [1, -1])
+            scale([1, i, 1])
+            translate([left_support_off, -left_support_len - 10, -20])
+            rail_2020_y(left_support_len, "left support");
+            
+            color("grey")
+            for (i = [1, -1])
+            scale([1, i, 1])
+            translate([x_axis_rail_len - 20 - right_support_off, -right_support_len - 10, -20])
+            rail_2020_y(right_support_len, "right support");
+            
+            // TODO feet
+        } else {
+            color("grey")
+            translate([x_axis_rail_len / 2, 0, -40])
+            for (i = [1, -1])
+            scale([i, 1, 1])
+            translate([x_axis_rail_len / 2 - bottom_support_off, -bottom_support_len / 2, 0])
+            rail_2020_y(bottom_support_len, "bottom supports");
+            
+            // TODO feet
+        }
     }
 }
 
 //y_carriage_post();
 //x_carriage_holder();
 
-translate([0, -50, 0])
-y_carriage(0);
+//translate([0, -50, 0])
+//y_carriage(0);
 //y_carriage(1);
 //y_carriage(2);
 //x_carriage();
 //x_axis();
 
 //assembly();
-//xy_table();
+xy_table();