[ChrisH]

What G-code generator are you using? We use ReplicatorG and can set speeds there. It is pretty easy if you know where. Other programs will be different.
ChrisH

Originally Posted by JesseK

Aluminum pullies. There seemed to be a fine line between just tight enough to print and so tight that the plastic around the idler pulley warps during printing. If there were a way to set the max speed of movement we'd be fine -- the belts only slip when there's an immediate high-speed reversal of the 'Y' motor (coincidentally, also the hardest motor to tension).