I remixed this from a thing that seems to be gone. It was in 3 pieces, and I needed 1 piece. But my source thing was also a remix, and I am now linking directly to the primary source.
My Cetus printer is tall enough to print this wand in one piece. So I joined the pieces together. I printed standing up with supports.
This wand has a channel through it and a space at the base. The purpose is to put an LED at the top and a 2032 battery at the base. I soldered two strands of the solid telephone punch block style insulation displacement copper wire to a color changing LED. The wires stick out the back. Then I force the battery into the end, and the insulation is cut and makes a connection.
The battery will be on all the time this way. If you don't force the battery all the way in, you can pull it out to turn the LED off. I have not tried it, but I also put a little hole on the side to offer a chance to push the battery out from the inside.
Amazon sells LEDs like this: https://www.amazon.com/Full-Multi-color-Slow-Flashing/dp/B01AT5EAPQ
2032 Batteries: https://www.amazon.com/Energizer-Lithium-Battery-Original-Packaging/dp/B00FO9HQLS