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==Bike Chain Tensioner==
Project developed by [[User:Spoonless]]
This chain tensioner can be used to address issues with chain hopping, chain slap, and rattles. It can be printed and assembled for less than $6, and offers equivalent perfomance to comercial products sold for $30.
== Bill of Materials==
# [https://github.com/SpoonlessCorey/OSAT_BikeChainTensioner Tensioner.scad]
# (2) ZipTies
# (1) 8-32 Thread, 1-1/4" Length Machine Screw (eg. [http://www.mcmaster.com/#91792a201/=uvhjkl McMasterCarr:91792A201])
# (1) 8-32 Thread Locknut (eg. [http://www.mcmaster.com/#91831a009/=uvhlvw McMasterCarr:91831a009])
== Tools needed for fabrication of the OSAT==
# [[Delta_Build_Overview:MOST| MOST Delta RepRap]] or similar RepRap 3-D printer
# Adjustable Wrench or Pliers
== Skills and Knowledge Necessary to Make the OSAT ==
* Ability to use a 3d printer.
* Ability to use a wrench and screwdriver.
== Technical Specifications and Assembly Instructions==
All parts are symetric such that component orientation is not an issue.
# Ziptie the cage to the Bicycle frame just above chain.
# Hold the chain up so it is captured in the cage.
# Bolt the pully in place
# gently crank the pedals by hand and shift throug all gears to ensure nothing is binding
=== Common Problems and Solutions===
* If the fit to they bicycle is loose or overly tight the OpenScad variable "pipeDia" can be set to match your bike frame's tubing diameter.
== Cost savings==
* Approximatly $23.50 (78.3%)
** 30g of PLA at approx. $30/kg = $0.90
** Machine Screw, Locknut, and bag of zip ties approx $5.60 at local hardware store
** Equivalent Chain Tesnsioner: [http://www.amazon.com/Bionicon-7640162290111-c-guide-eco/dp/B00HZRCZBS Bionicon C.GUIDE] approx. $30
** 30 - (5.60 + 0.90) = $23.50
[[category:OSAT 3D-Printable Designs]]