Sonic Trowel (LED)

thingiverse

Here is my version of Sonic Trowel from Dr Who designed for a kid. There are two versions, a regular one and an LED version. For the LED version, use a 3mm blue LED, a micro on/off switch, and a CR2032 3V battery. You'll find there's enough space to fit the battery holder inside the handle - just thread the wire through and connect it to the LED. The two pieces of the handle should fit snugly together so you can easily swap out the battery when it runs out.