The tray is stacked with the feeding system. The model is made up of the z-axis by means of the self-made screw module, the x axis is moving.The whole set of lifts.This model is transformed into step and iges general model download, please refer to!Also includes 3d original files, welcome to download!if you like,you can paypal for you to get this models or if you have any questions also you can email to me.