Hi,
I'm new to this forum and the "scene" of making lightsabers.. but I had an idea that could make it possible to slide the blade up and down. Basicly, the polycarbonate tube is sliced into three sections, where two of them are sliced in 3 more parts. This way, you can have a blade lenght of three times the hilt. This picture should explain it better:
This is of course only a rough design, and there are issues like should there be an electric motor to power it up etc. Also, when light is applied the 2 lines are probably going to be somewhat visible, but that is a trade-off for this feature..
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