While you haven't given us all of the details and haven't shared the settlement agreement (I assume that it was in writing), the Court should still have jurisdiction over your case.
You say that the defendant bought material from you, I am not sure whether you are a company or an individual. If you are a company, according to the Ohio Supreme Court, you must have a lawyer represent you, otherwise you are practiceing law without a license and the Court should not hear you. If you are an individual, you can represent yourself. So, either you or your attorney should, depending on your settlement agreement, file a Motion to Enforce the Settlement in the same court with the same case number. There may or may not be a filing fee, depending on the court, but there will likely not be a full, new case filing fee.
Answered on May 14th, 2015 at 2:24 PM