You must first receive a Return Material Authorization ("RMA") from us before completing an Item return, regardless of the reason for the return. This applies to all Item returns permitted under these Terms of Sale. For items such as kits or machines, we do not accept returns once you have begun constructing the kit or otherwise begun to use the machine. We are not obligated to accept any return without a proper RMA. Unauthorized returns will be reshipped to you at your expense. We also reserve the right to impose reasonable handling charges in the event we either accept or reject an unauthorized return, as well as re-stocking fees as posted at the Site or otherwise charged from time to time.