This is one of the smallest knex ball machines on instructables. I just took Leigo Andre's hof ball machine and took out some unnecessary pieces. The ball machine is not smaller than hof, but it uses less pieces. Sorry I don't have a video, but it works the same as hof. The only knex ball machine on instructables that uses less pieces is hof jr.
Step 1: Parts Count
Dark Grey - 1
Light Grey - 6
Orange - 8
Green - 4
Purple 3D - 16
Yellow - 6
Blue 3D - 2
White - 3
Green - 4
White - 6
Blue - 29
Yellow - 5
Red - 4
Regular Chain Links - 13
Blue Spacers - 8
Silver Spacers - 10
Ball Halves* - 2
End Cap - 1
Red Gear - 4
Y Clip - 2
Tan Clip - 2
Green Motor - 1
*Knex balls should work with this machine, but I used a golf ball because I don't have a knex ball.
Step 2: The Body
Pics 1 and 2: Make these sides.
Pic 3: Connect them with blue rods on the back.
Pic 4: What you should have.
Step 3: The Track
Pic 1: Make this little piece.
Pic 2: Snap it on the bottom like this.
Pic 3: Add a red rod with two silver spacers here.
Pic 4: Make these track pieces.
Pics 5 and 6: Snap the track pieces on the red rod.
Pic 7: What you should have.
Pic 8: Don't forget this stand.
Step 4: The Motor
Pic 1: Add the motor and a red rod with two blue and a silver spacer on it.
Pic 2: Put two red gears onto the red rod and hold them on with tan clips.
Pic 3: Slide two red gears on a blue rod with two blue spacers on both sides.
Pic 4: Snap the rod with red gears on the top of the body.
Pic 5: Put an end cap here.
Step 5: The Chain
Pic 1: Make these.
Pic 2: Connect the chain in two pieces.
Pic 3: Snap the grabbers on the chain like this.
Pic 4: Connect the two pieces of chain together.
Pic 5: Snap the chain on the red gears. I will be hard to put on, but it is not impossible.
Pic 6: Add these two chain links in front of the grabbers.
Step 6: Your Done!!
Now you have made one of the smallest ball machines ever!