mkc

Are you getting holes where the stitches should be, or is it just making long stitches?

If the latter, it's the encoders. They need to make good contact to the rails since they tell the head how much it's moved. Make sure the rails on the table and on the carriage are clean and smooth, and that the encoder wheels are making good contact. Have someone watch to make sure they are rotating smoothly with the head movement. Also check to make sure the encoder plugs are tight and clean and that the wires aren't catching on something.

If you're getting holes, it could be too high of a tension, too small of a needle, or moving the head too fast.