Automatic up and down feeding platform,The mechanism cleverly uses the X-axis cylinder to move through the guide rail and roller 1.Reducing the space2. Increase the stress load************************************** Files format contains-solidworks 2017-step-iges-stl-obj-3ds- and other formats************************************** If you like,you can paypal for you to get this models or if you have any questions also you can email to me.**************************************