So I think I have fixed at least this design to work for any line input. Although it is bulky. Shout out to ssilk for the starting design. Note: |---| is the direction the underground belt is running. | | is the opening. upper lane: > > 1/4 #---#\ > > 0 ---- #\ >##### > > 1/2 #-# > > 1/4 #---#-#-#-#...