So we came up with a cheap and easy way to hack the Etch-A-Sketch so that not only can you draw the old way, but you can draw a perfect circle wherever you want too!
For this hack you're going to need:
1x Metal Wire (we took ours from a hanger)
1x Plastic Ring From A 2-Liter Soda Bottle
1x Sharp Edged Pick (something that can bore a hole into plastic)
Super Glue, Duct Tape, Scissors, and other miscellaneous parts...
Warning: Although the Aluminum Powder inside the Etch-A-Sketch is Non-Toxic, it does get everywhere, and I mean EVERYWHERE! So prepare the area where you'll be operating on the Etch-A-Sketch accordingly.
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Step 1: Opening Up The Etch-A-Sketch
Remove the knobs from the Etch-A-Sketch, then use whatever tool you have to separate the front and back of the etch a sketch at the seam.
You'll discover that the front plastic, in our case the blue Toy Story design, is actually just a cover, all the aluminum powder and plastic beads are sealed behind the glass and plastic.
Step 2: Making The "Circle Maker"
For those of you who don't know how an Etch-A-Sketch works, the knobs move a plastic stylus that scratches the super sticky aluminum powder off of the glass.
So we want to make a plastic circle with sharp edges that will scratch the powder off the glass to form a circle when you twist the knob.
I used the plastic ring from a 2 Liter Soda Bottle and taped/glued it to metal wire from a hanger to make this device, but you can experiment with other stuff to get similar or better effects. Just make sure you're able to twist the plastic circle easily.
You should use a scissor to scratch the surface of the ring so it'll be rougher.