Screeching Noise when moving the Z-Axis Down
I had this same problem. I attributed it to the linear bearings which ride on the 8mm travel rods. I did two things which ultimately eliminated the issue (since I did both at the same time, I'm not sure which solved the issue, but believe it's #1 below):


I replaced all of my ball type (stock) linear bearings with Igus Drylin linear bearings. I'm pretty sure the metal ball bearings were screeching along the 8mm metal rods. The Drylin bearings pretty much eliminated any noise on the rods. I replaced all of them for X, Y, &amp; Z axis rods at the same time. 
I used white lithium grease (just a small amount) on the Z-axis screw rod. This helped everything travel better. It should also help it last longer by preventing wear. 


Since I've done this, I've not had any screeching anymore. You don't have to use Drylin linear bearings, as there are other printable options on Thingiverse.com.