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Here's how I made Riptide, the expandable sword from Percy Jackson. Three different version were made here, the first being a CO2 powered telescoping rod, however this didn't resemble a sword all that much. The 2nd version used a magic expandable staff inside a 3d printed pen shell to produce a sword when twisted. The 3rd sword used a full metal expandable sword, that was modified to fit inside a pen case. This version was more robust and could cut things. Enjoy

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