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You should have received the instructions on how to build it with the purchase. Go back to your email confirmation to see if it had a down load link.

What board dimensions are you using for the design board? Is your carving board centered in your jig? What do you specify at the start of the carve, under rollers yes/no, and the carving placement? ...

A picture of your carrier base would give us a better idea on what advise to give you.