About this 3D model
!!!!! I have posted a updated version of this design that improves reliability !!!!!!!!Version 2 is available here: http://www.thingiverse.com/thing:1299265This is a multipart accessory to any standard servo that converts it output into a linear motion. Designed, tested and 3D printed on makerbot style (FDM) printers this should work for you and your next robotics project.