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here is an instructable of a micro knex station for a roller coaster
you need to make the backing
now you will make the part that makes it move
now you will make the front
you will make other parts
now you will make the track
you will need 49 chain links
now you will put the gears into the front and back, add chain, add thrack, and add the misc. peices
New K'nex Roller Coaster Propulsion Systemby sgtmik
Full Throtle Knex roller coasterby Tornado96
Challenge: Coasterby NPTechman
Knex Firestorm Freefall Coasterby knexboy586
K'nex roller coasterby hi1
Loop. A knex roller coasterby hi1
Knex roller coaster: Rippin' Rocket 3by knexinventions 49
3.5 ft tall K'Nex Roller Coaster (vertical)by yoshiinstructable
Lempomo cliff knex roller coasterby the_burrito_master
The Phoenix- A K'nex Roller Coasterby Jag56
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