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 space 2. 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. **************************************