Slightly improved version of the 11th Doctor sonic screwdriver, still needs some tweaking to make it more robust especially the slider switch and connection between top and bottom, but a bit of superglue works.

Needs:

• White, Silver, Black and Clear PLA
• PLA breakaway
• 3mm blue LED
• Thin wire
• 2 LR 44 batteries
• A bit of super glue
• Patience and creativity