Made a cup holder using Marine Grade HDPE or Starboard. I used a Vision Engraving & Routing Systems 2550 CNC Router
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The finished product, no screws needed.
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Cup holder with holding, what else cups. lol
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On a Vision Engraving & Routing Systems 2550 CNC Router, routing out the parts.
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The routed out parts for the cup holder.
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Screen shot.