I am using 1,5l coca cola bottles.
But before cutting the bottle apart to wrap around the mold I drill a small hole in the cap and pump up a pressure with a bicycle pump. (around 2 bar) Then I carfully go over the bottom end with the heat gun to smoothen out the bottom end. This gives me a little more plastic to work with.
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Kyosho RB5 SP: RB5 Mid: ZX5 FS: Orion: Spektrum
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