A nightlight in the shape of a Kodama from the movie Princess Mononoke. The model is based on rallekralle's Sitting Kodama Mix.

The light is turned on by pressing the button on the bottom of the Kodama. The brightness is adjustable by an optional potentiometer on the inside. For accessing the electronics and changing the battery, the head can be removed. The LED is powered by a single 3V CR2032 battery. 

Additional required parts

• 3 mm LED Sloan L3-W36N-BVW or similar
• CR 2032 battery holder RND 305-00038 or similar
• CR 2032 battery
• Push button RND 210-00652
• 10 kΩ Potentiometer (optional) Bourns PTV09A-4020U-B103 or similar
• 2.2 kΩ resistor (if using potentiometer)
• 10 Ω resistor
• Wire
• Shrinking tube

Additional required equipment

• Soldering iron
• Solder
• Superglue
• Multimeter for checking circuit

Suggested printing equipment, material, and settings

• Nozzle: 0.4 mm
• Material: PETG
• Color: Clear
• Layer height: 0.2 mm
• Infill: 15%
• Infill pattern: Octagram Spiral
• Overhang threshold: 40°

Printer used for prototyping: Prusa i3 MK3S

Assembly instructions

1. Glue the middle part (neck) to the bottom part (body).
2. Solder all electronic components together according to the schematics below, except for the push button. If you do not want to include the potentiometer, just connect the positive pin of the battery holder directly to the LED, also omitting the 2.2 kΩ resistor. You can try different resistor values for tweaking the brightness.
3. Mount the push button on the internal_bottom part. Guide the remaining unconnected wires through the cylinder of the internal_top part and solder them to the push button.
4. Put the LED in one of the three holes of the internal_top part. Arrange the electronics as shown in the pictures.
5. Glue the battery holder to the internal_top part and the internal_bottom part to the internal_top part.
6. Put everything together. The friction between the parts should be enough to keep them in place.

Have fun :)