diff --git a/scad/vitamins/linear-bearings.scad b/scad/vitamins/linear-bearings.scad
index 185fcf4..aca8e76 100644
--- a/scad/vitamins/linear-bearings.scad
+++ b/scad/vitamins/linear-bearings.scad
@@ -7,6 +7,7 @@
 //
 // Linear bearings
 //
+LM12UU = [30, 21, 12];
 LM10UU = [29, 19, 10];
 LM8UU  = [24, 15,  8];
 LM6UU  = [19, 12,  6];
diff --git a/scad/vitamins/sheet.scad b/scad/vitamins/sheet.scad
index a35e72f..0923259 100644
--- a/scad/vitamins/sheet.scad
+++ b/scad/vitamins/sheet.scad
@@ -23,6 +23,7 @@
 MDF6     = [ "MD", "MDF sheet",            6, [0.4, 0.4, 0.2, 1    ], true];    // ~1/4"
 MDF10    = [ "MD", "MDF sheet",           10, [0.4, 0.4, 0.2, 1    ], true];    // ~3/8"
 MDF12    = [ "MD", "MDF sheet",           12, [0.4, 0.4, 0.2, 1    ], true];    // ~1/2"
+MDF19    = [ "MD", "MDF sheet",           19, [0.4, 0.4, 0.2, 1    ], true];    // ~3/4"
 PMMA6    = [ "AC", "Acrylic sheet",        6, [1,   1,   1,   0.5  ], false];   // ~1/4"
 PMMA8    = [ "AC", "Acrylic sheet",        8, [1,   1,   1,   0.5  ], false];   // ~5/16"
 PMMA10   = [ "AC", "Acrylic sheet",       10, [1,   1,   1,   0.5  ], false];   // ~3/8"