This instructable will show you how to build a K'nex 1 speed gearbox that will make a motor go faster/slower. This is my first instructable sorry if it is unclear and some of the pictures are blurry.
p.s it is based on a gearbox that I found on Youtube its here
if you want to see it.
pp.s Give credit to spoonman192
ppp.s remember to use SANYO eneloop Batterys for the motor.