Chain Guard.jpg

The OSAT piece is a universal chain guard for a bicycle. It improves the safety of a bike for people who may not have access to a new bike or chain guard and is attached simply by string or a zip tie. There hasn't been case studies regarding chain guards however there have been stories and research into the significance of bikes in developing countries. Bikes help alleviate poverty in developing countries.

Chain Guard Bottle.jpg

Bill of Materials[edit | edit source]

  1. PLA Filament
*OpenSCAD and STL Files can be found here [1]
*File:Bike chain guard2.scad
  1. 2 Liter Bottle (free from recycling)
  • Attachment Method:
2.Zip Tie
  • Adhesive:
1.Super Glue
2.Hot Glue

Tools needed[edit | edit source]

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. Potentially a Hot Glue Gun

Skills and knowledge needed[edit | edit source]

  • None

Print Instructions[edit | edit source]

For all printed components

Material: PLA

Layer Height: 0.2mm

Shell Thickness: 0.8mm

Fill Density: 15%

Print Speed: 70 mm/s

Printing Temperature: 210 C

No supports necessary.

Total Printing Time: 1 hr 45 mins

Assembly time: >5 min

Assembly Instructions[edit | edit source]

  1. Cut a section of 6" by 2.5" from the 2 Liter bottle
  2. Glue the bottle in the seam of the 3d printed part see image below
  3. Use string or zip tie to attach to bike
Chain Guard Attach.jpg

Common Problems and Solutions[edit | edit source]

  • There were no problems with building or printing, more testing would be necessary for improvements.

Cost savings[edit | edit source]

  • PLA Material: $0.38
  • Means of Attachment:
1. String: $0.003 (third of a cent for a 6 in piece)
2. Zip tie: $0.01
  • Adhesive:
1. Hot glue: $0.005 (half a cent or less of glue)
2. Super glue: $0.03

Total: $0.39-$0.42

Commercial: $24.28 [40J2RZJd6KWCrxUYCbE1q6TvbKL4gAYF3TibSvuNbDy8S0EaArcTEALw wcB, 24 in Guard]


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