Iron Grey Premium PLA. Low warp, easy to print.
This filament prints amazingly well, possibly the easiest to print with I have used.
The color is very pleasing, I have printed a few mechanical parts, and they have come out amazing.
see the photos in: http://www.thingiverse.com/thing:1642930
And a Moai statue: http://www.thingiverse.com/thing:144668
This PLA prints a little cooler than most others, on my machine as low as 180, in comparison to normal 195 - 210.
I would recommend PID tuning M303 S190, C8 as a matter of course,
which can help remove some of the 'wood grain effect'
One thing, it is slightly more flexible than the FilaPrint Ripe Orange Premium, which I love.
FilaPrint Iron Grey Premium PLA 1.75mm printed really well for me. The colour is great for picking out details in the print without highlighting layer lines.
Printed well at low temps 195/50.