This holder was designed for use with 2032 button cells and the candle flicker LEDs from Evil Mad Scientist. The button cell clicks into the holder from the top and is gripped. This is because the semi-circular bits overlap the centre line of the button cell just enough to grab it.

To use with LEDS - simply put the arms of the LED through the cross pieces as shown in the photo. You might need to bend the cross pieces out slightly first in order to get the arms in.

You can also use this holder with normal wires - just wrap the wires once around the cross pieces. and push the cell in from the top.

I'm going to make some printed tea lights for Christmas, and drop these LED+2032s into them to get a flickering effect! I'll post the tea lights here when they are done.

When you print this, you can see that span of the cross pieces is not supported. However, most printers can manage this OK.