Maker and Thingiverse user ManWithoutOptions is building his own peristaltic pump so he decided to see if he could design and 3D print his own reduction gear that would work with the low torque DC motor that he wanted to use. He initially checked Thingiverse but found that they wouldn’t work well with the small toy DC motor, so he took inspiration from their designs and tweaked them until he came up with a gear design that worked perfectly with his little motor. You can read more about this great educational project over on 3DPrint.com: http://3dprint.com/120068/reduction-gear-train/