What's the recommendation for the retract speed with the titan extruder? 100 - 150mm/s? I'm using mine in a bowden configuration with a SeeMeCNC Rostock Max v2, printing PLA with a e3d v6. Just trying to get a feel for if there's a speed people have found that works well. (And a retract distance to go with the v6 and a bowden would be welcome if others have experience there, too!) Thanks!