The first step in this project is to consider the heights you need.  I chose to do some common heights of ¼, 1/8, and ½. You can use these steps to create any size you need.

Since all of my heights are under 1 inch, I inserted a right triangle with a height of one inc.  I then added a rectangle.  I will size the rectangle to the height needed. 

At first thought, the solution seemed simple, just create a rectangle that is exactly ½ an inch and subtract it.  This method however, is inaccurate because it does not account for the kerf of the laser.  My laser is a D1 with a 5w laser.  The kerf is .08 mm, which is basically .003 inches.  We will need to subtract this from the height of the notch.  By doing this we will move the laser down the width of its cut, so that the outer edge of the cut will be exact height of the notch used for setup. 

The good news is, If you mess this part up, it is only .003 inches off, so it is minimal.  You will still be very close.

Once we have our first triangle and rectangle set up ready to subtract, let's first copy the two shapes and paste them to the side.  You can then subtract the rectangle from the triangle to make the notch

Using the copied parts, use the same steps as before to set up the next jig.  Just remember to copy and past before you subtract it. 

Finally, I added a text label to each jig so I know the height it is measuring. 

The last step is to move the parts so that they fit tightly together.  Doing so will minimize the amount of material used.