I wanted more light but 3 LEDs pull too much current for a CR2032 cell. I therefore designed this base to run from a 2 AA battery pack.on a short lead;

How to wire this up (a little fiddly)

• Bend the 2 outer LED leads furthest from the power input in to the channel, trim the leads so they only just reach the centre LED, an solder them to centre LED

• Solder an insualted power lead under those leads, pushing it in to the left channel cut-out so it will dip under the other channel

• Repeat the first 2 steps for the other leads using the channel nearest the power input

• Trim the connections

• I fit a rubber or felt cover on the base to prevent short circuits and damage to the surfaces it's placed on.

I use 5 mm slow colour-changing RGB LEDs but almost any type and size can be used. These LEDs are very bright but have a narrow beam angle so made a sinple diffuser to drop over the 5mm LEDs (link)

The battery pack I designed for this (and shown in the photograph) can be found at [https://www.thingiverse.com/thing:2821282](https://www.thingiverse.com/thing:2821282)