Update README.md

README.md

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 Cutting and folding sheets may be the fastest way to put precision features on multiple planes.  A sheet fabricated prototype can go from design to part in minutes and scale to massive production volumes.
 
+<img src='img/cardboard-1.jpg' height=200px>
+<img src='img/cardboard-2.jpg' height=200px>
+<img src='img/cardboard-3.jpg' height=200px>
+
+
 
 ### Materials
 
@@ -16,10 +21,17 @@ Cutting and folding sheets may be the fastest way to put precision features on m
 * Stainless Steel
 * Aluminum: Must be a formable series, like 1100 or <a href='https://www.onlinemetals.com/merchant.cfm?id=753&step=2&top_cat=60'>3003</a>
 
+### Cutting Tools
+
+* <a href='http://cba.mit.edu/tools/display/?type=tool&id=universal_laser_x2600_laser_cutter#'>Laser cutters</a>
+* <a href='http://cba.mit.edu/tools/display/?type=tool&id=omax_2652_waterjet_cutter#'>Waterjet</a>
+* <a href='http://cba.mit.edu/tools/display/?type=tool&id=zund_g3_l-2500_digital_cutter#'>ZUND</a>
+
+
 ### Creasing Methods
 
 * Press Brake
-* Finger Brake
+* <a href='http://cba.mit.edu/tools/display/?type=tool&id=finger_brake#'>Finger Brake</a>
 * Vice Bending
 * Perforating
 * Half-cutting
@@ -31,7 +43,6 @@ Cutting and folding sheets may be the fastest way to put precision features on m
 * K-Factor
 * Relief
 
-
 ### Design tools
 
 * Fusion 360 sheet metal: