FollowUp: I have used the machine extensively, including a 1hr 50min run and the temperature never exceeded that of the room. If I was to do this again, I would use a two fan radiator. ~P. In this video I show you how I implemented a radiator style cooling system for the spindle on a CNC Router. All the components of the system are carried on the carriage, thereby removing all the overhead hoses and wires. Radiator and flow gauge : Pump and reservoir: Silver sliver: This modification came from a comment in my Lessons Learned video. @King Red Leg suggested the idea of using a closed loop computer cooling type hardware and it is working great.