Ender 3 Z-Axis Upgrade Kit with Two 55CM Aluminum Frame and Lead Screw Enlarging 15CM Printing Space for Ender 3/Ender 3 Pro This Upgraded Ender 3 Z-axis 2040 Profiles made by high aluminum material,high wear-resistance which make it possible to bear high load.The cut are so flat and smooth with clear lines are durable and stable. After you install this Z-axis profiles kit, the print height will be higher 100mm then previous print size. Achieved one printer with two printing size, if you want to print higher items, you can just replace this Z-axis profiles kit and use it. P3-P7 linear rails, precise and smooth, the repeated positioning precision reached up to 0.1mm, The capacity of bearing high load supports high-speed and strong motion. This Z-axis 2040 profiles kit is suit to Ender3 series, such as Ender3/Ender3 Pro. The profiles size is L550mm, the linear rail size is L515mm. The firmware and installation tutorial are in the U disk of the distribution package