Quote Originally Posted by jfkansas View Post
I think it depends on the machine and how many extruders are installed. If it is the Replicator 2 with single print head the amount of mass to move is about half that of a dual print head. There are some 1st and 2nd law of physics going on here. I have the left feedstepper removed along with all the wiring and hot end and I can definitely print at 90mm/s and travel at 150 (Creator X with pro upgrades). However generally I print at 80mm/s and travel at 120. It also depends on the part size I am printing. For small parts I usually back down to 60mm/s and travel at 80. On small parts there just isn't that much travel and I would rather save the wear and tear on the machine. With small parts and acceleration it really doesn't have time to get up to full travel speed anyway.

I am assuming the default 90/150 is for the Replicator 2 with 1 extruder.
Yeah good point, you know I never really even thought about the weight of the head, I just sort of assumed naturally it was more an extrusion issue with the head moving too fast to extrude efficiently