Cool, First post in the Kraken Forum The Kraken is a great hot-end, it's the easiest multi-extruder setup I have ever encountered, to calibrate, mount and control. It's also my ONLY hot-end that works really well at high speed with a direct drive extruder. I normally use geared, but for the quad extruder setup, I have opted for direct drive x 4 all in a line. I'll post some photos and files soon. Look out for a review of the Kraken, V4/5 and lots of other hot-ends in the next issue of the RepRapMagazine http://reprapmagazine.com/ (Issue 3) - It covers a year of using various hot-ends in real-world printing on lots of different RepRap machines.