The upper and lower parts assembly is specially designed to support printing multi-color consumables. The upper and lower material components: left / right, and there are corresponding slots on the left / right upper and lower feeding ports. The left upper and lower feed port corresponds to slot 1 and slot 2 / the right upper and lower feeder corresponds to slot 3 and slot 4. The left / right upper and lower materials are only slightly different in structure, but the functions and uses are completely the same. Please note that the left / right upper and lower components can only be installed on each respective slot. please confirm the version before purchasing. The left / right upper and lower feeding assemblies have special motors and gears for active pushing the consumables forward. After inserting the consumables, the component will automatically pull the consumables and send the consumables to the tool head through the teflon pipe. Hign-concerned Chemical:None Item Type:J-head Color: Black Material: plastic Package Contents: 1 * Printer material components accessories Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.