Got a stepper driver running a bit too hot? Vreg going into thermal shutdown? Here's a heatsink, for small applications.
The big trick to making power electronics run consistently is the cooling. A bit too hot, the stepper starts dropping steps, or the voltage regulator starts choking power. Sometimes you need just a bit more cooling to make it better.
Aluminum is a great media for heatsinks, right behind copper and gold. These little units are ideally suited to be thermally glued to any small IC needing a bit more assistance in pulling the heat away.