When making sashing with a bias tape maker, for example for quilt as you go, before putting your fabric strip through the sashing tool cut the strip just slightly less than the required width. For example, if you're using a bias tape maker to produce a 1 inch sashing, the instructions will tell you to cut a fabric strip 2 inches wide. Instead, cut it a scant 1/8 inch narrower. It will fit into the bias tool much easier and will flow through it better.