Instructables
Picture of Fun wood coasters using laser cutter
Made this at Techshop.ws

You will need:

Plank of wood
Laser cutter/etcher
Some wood cutting tools -- I used the vertical band saw
A few images with a common theme
 
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Step 1: Create your coasters on Illustrator and laser the images

Picture of Create your coasters on Illustrator and laser the images
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4in by 4in is a good size

Design your coasters however you like. Would be good to stick with a theme here. 

Download my .ai file in the attached section if you'd like to use it.

For rastering - 75 speed/ 90 power

Step 2: Cut out the squares

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Cut out your coasters by following the square lines you rastered

Step 3: Lastly, sand down the edges

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Lastly, sand down the edges and round the corners.

No more cup imprints on your coffee tables!
Those look awesome! Love the designs you chose, so creative :D