Step 1: Ingredients:knife ,plastic

Step 2: First Step:Sculp the Plastic

Step 3: Second Step:Fill With Water

Step 4: Last Step:put in Freezer

Step 5: Tada!finish

<p>I don't believe that you made depressions in polypropylene with a knife. You would have to heat it first, or else you would simply perforate it if you attempted to sculpt it.</p><p>But besides that, it's clearly a different piece of plastic in the later pictures. That's a purchased mold that you just filled with water and froze. :(</p>
instructions for making ice congratulations!
<p>Uh... what?</p>

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