I have tried to follow the guide. But it seems this is not clear to me. Can someone please help me? I have replacef the screw on the x endstop with a shorter 20-25mm screw. 1. if i select prepare/auto home, the printer head moves and bounces off the end stops/ 2. after auto home completes the print head DOES NOT go to home position on the bed. as shown in build guide video here.. 3. this is what happens when I auto home... https://www.dropbox.com/s/mn7rdj3s6v93bxr/2016-07-15 06.40.08.mp4?dl=0 https://www.dropbox.com/s/ngcx30qhtug6pkq/2016-07-15 06.40.17.mp4?dl=0 Please help. Thank you!