Chinese Leather Patcher Bobbin

thingiverse

A bobbin for the "Chinese Leather Patcher" hand crank sewing machine. I made the bobbin a little bit taller to gain more thread capacity. Replaces the metal bobbin which can be hard to source (the machine does not take a standard bobbin). One piece also included if you want to resin print or try supports (i suspect you may get an inner surface that is rough and may catch the thread). Drill a small hole in one side near the center to start the thread before winding. I wind mine by chucking it in a small cordless drill with a bolt (the bobbin winder on the chinese leather sewing machines is a bit awkward). Update: I calculated the loaded thread weight (weighing empty bobbin, weighing loads bobbin, difference is thread weight) of the stock metal and the 3D printed bobbins. Both used same thread (135 nylon). The stock metal bobbin holds .69 grams and the 3D print holds .96 grams, which is a 39% increase.