Although my heatsink might be slightly different you can see a nice tutorial on how to build one of this DIY style.
There is enough space and Heatsinking to use a Simple LM350 Driver like i did in my review.
I have Upgraded to a different driver now in that build but before that this was my first 2W+ laser that i built over 6 months ago and is still going strong.
Get barely warm after a 10 minute run. Although i do not recommend you run it that long and stick to a ~1 minute on/off duty cycle.
These heatsink look larger then mine So it will be even more cooling.