Ok, first off... Morph. check this link
www.hobbycnc.com all sorts of stuff there.
also
www.desktopcnc.com
also.....
I have taken 2 identical waterblocks. Both Original Spir@ls
one of copper, and one of aluminum.
And with the same setup...... I got the same temps. using a temp probe touching the die.
Now this is prolly due to the fact that the system may not be tuned exactly right. Example (I have a small rio pump in a res)
so whjy would I trash endmills, and waste 3 more hours machinine the copper when I can machine the aluminum in 1/3rd of the time?