This lift uses two sets of arms that alternate on going up and down. The balls are shifted from one side to the other when the arms move. It uses a double crank at the bottom and a gate system to keep the balls in the lift.
Note: this lift works with both the original and newer Knex balls, but it isn't reliable with the newer balls. Modifying would be a good idea if you want it to work better with the newer balls.
Push the switch of the motor inwards for smoother movement.
Here's the video of the lift in action:
Direct video link
So, if you want to build it, let's shift to the next step!
Step 1: Piece Count (Optional)
dark gray- 40
light gray- 1
blue spacer- 26
silver spacer- 28
tan clip- 7
Y clip- 24
small blue/brown gear- 1
red gear- 2
newer-style battery-powered motor (green)*- 1
*You can use a different motor if you wish, but you'll have to modify the motor section.