diff --git a/vitamins/linear_bearing.scad b/vitamins/linear_bearing.scad
index 1cc699b..5510a2d 100644
--- a/vitamins/linear_bearing.scad
+++ b/vitamins/linear_bearing.scad
@@ -25,20 +25,41 @@ include <../core.scad>
 use <../utils/tube.scad>
 
 bearing_colour = grey70;
+groove_colour = grey60;
 seal_colour = grey20;
 
-function bearing_length(type)  = type[1];   //! Total length
-function bearing_dia(type)     = type[2];   //! Outside diameter
-function bearing_rod_dia(type) = type[3];   //! Internal diameter
+
+function bearing_length(type)           = type[1];   //! Total length
+function bearing_dia(type)              = type[2];   //! Outside diameter
+function bearing_rod_dia(type)          = type[3];   //! Internal diameter
+function bearing_groove_length(type)    = type[4];   //! Groove length
+function bearing_groove_dia(type)       = type[5];   //! Groove diameter
+function bearing_groove_spacing(type)   = type[6];   //! Spacing between grooves, outer to outer, ie includes the grooves themselves
 
 function bearing_radius(type)  = bearing_dia(type) / 2; //! Outside radius
 
 module linear_bearing(type) { //! Draw specified linear bearing
-    vitamin(str("linear_bearing(", type[0], "): Linear bearing LM", bearing_rod_dia(type),"UU"));
+    vitamin(str("linear_bearing(", type[0], "): Linear bearing ", type[0]));
 
     casing_t = bearing_radius(type) / 10;
     casing_ir = bearing_radius(type) - casing_t;
+    length = bearing_length(type);
+    or = bearing_radius(type);
+    gl = bearing_groove_length(type);
+    gr = bearing_groove_dia(type) / 2;
+    gs = bearing_groove_spacing(type);
+    offset = (length-gs)/2;
 
-    color(bearing_colour) tube(or = bearing_radius(type), ir = casing_ir,                 h = bearing_length(type));
-    color(seal_colour)    tube(or = casing_ir,            ir = bearing_rod_dia(type) / 2, h = bearing_length(type) - 0.5);
+    if(gs==0) {
+        color(bearing_colour) tube(or = or, ir = casing_ir, h = length);
+    } else {
+        translate_z(-length/2) {
+            color(bearing_colour) tube(or = or, ir = casing_ir, h = offset, center = false);
+            color(groove_colour) translate_z(offset) tube(or = gr, ir = casing_ir, h = gl,center = false);
+            color(bearing_colour) translate_z(offset+gl) tube(or = or, ir = casing_ir, h = gs-2*gl, center = false);
+            color(groove_colour) translate_z(offset+gs-gl) tube(or = gr, ir = casing_ir, h = gl, center = false);
+            color(bearing_colour) translate_z(offset+gs) tube(or = or, ir = casing_ir, h = offset, center = false);
+        }
+    }
+    color(seal_colour) tube(or = casing_ir, ir = bearing_rod_dia(type) / 2, h = length - 0.5);
 }
diff --git a/vitamins/linear_bearings.scad b/vitamins/linear_bearings.scad
index 0600601..1b26ff0 100644
--- a/vitamins/linear_bearings.scad
+++ b/vitamins/linear_bearings.scad
@@ -20,14 +20,24 @@
 //
 // Linear bearings
 //
-LM12UU = ["LM12UU", 30, 21, 12];
-LM10UU = ["LM10UU", 29, 19, 10];
-LM8UU  = ["LM8UU",  24, 15,  8];
-LM6UU  = ["LM6UU",  19, 12,  6];
-LM5UU  = ["LM5UU",  15, 10,  5];
-LM4UU  = ["LM4UU",  12,  8,  4];
-LM3UU  = ["LM3UU",  10,  7,  3];
+//                     L  od  id   gl    gd    gs
+LM16UU  = ["LM16UU",  37, 28, 16, 1.6, 27.0, 26.5];
+LM16LUU = ["LM16LUU", 70, 28, 16, 1.6, 27.0, 53.0];
+LM12UU  = ["LM12UU",  30, 21, 12, 1.3, 20.0, 23.0];
+LM12LUU = ["LM12LUU", 57, 21, 12, 1.3, 20.0, 46.0];
+LM10UU  = ["LM10UU",  29, 19, 10, 1.3, 18.0, 22.0];
+LM10LUU = ["LM10LUU", 55, 19, 10, 1.3, 18.0, 44.0];
+LM8UU   = ["LM8UU",   24, 15,  8, 1.1, 14.3, 17.5];
+LM8LUU  = ["LM8LUU",  45, 15,  8, 1.1, 14.3, 35.0];
+LM6UU   = ["LM6UU",   19, 12,  6, 1.1, 11.5, 13.5];
+LM6LUU  = ["LM6LUU",  35, 12,  6, 1.1, 11.5, 27.0];
+LM5UU   = ["LM5UU",   15, 10,  5, 1.1,  9.5, 10.2];
+LM5LUU  = ["LM5LUU",  28, 10,  5, 1.1,  9.5, 20.4];
+LM4UU   = ["LM4UU",   12,  8,  4,   0,    0,    0];
+LM4LUU  = ["LM4LUU",  23,  8,  4,   0,    0,    0];
+LM3UU   = ["LM3UU",   10,  7,  3,   0,    0,    0];
+LM3LUU  = ["LM3LUU",  19,  7,  3,   0,    0,    0];
 
-linear_bearings = [LM3UU, LM4UU, LM5UU, LM6UU, LM8UU, LM10UU, LM12UU];
+linear_bearings = [LM3UU, LM4UU, LM5UU, LM6UU, LM8UU, LM10UU, LM12UU, LM16UU, LM3LUU, LM4LUU, LM5LUU, LM6LUU, LM8LUU, LM10LUU, LM12LUU, LM16LUU];
 
 use <linear_bearing.scad>