Y-Stepper Fan/Heatsink Holder for Replicator 2 / 2x
If you enclose your build chamber, it's a good idea to add some extra stepper cooling. This clip holds a 55mm heatsink/fan snug against the back end of the Replicator 2/2x Y-stepper motor. It has plenty of clearance to all the moving parts.
I'm using it with this fan: http://www.amazon.com/gp/product/B006Z4J8JE
But any 55mm pin spacing heat sink / fan combo should work.