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Bike Chain Guard

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MOST Delta filament as guide.JPG This page was part of an MTU course MSE4777 OA and MSE4777 OB/MSE5777/EE4777/EE5777: Open-source 3-D printing

Please leave comments using the discussion tab. The course runs in the Fall semester. It is not open edit.

Bike Chain Guard[edit]

Project developed by User:Alyssa Knoester
This OSAT has been designed but not yet tested - use at own risk.
This OSAT has been prototyped.


  • 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.jpg
Chain Guard Bottle.jpg

Bill of Materials[edit]

1. PLA Filament

  *OpenSCAD and STL Files can be found here [1]
  *File:Bike chain guard2.scad

2. 2 Liter Bottle (free from recycling)

  • Attachment Method:
   2.Zip Tie
  • Adhesive:
   1.Super Glue
   2.Hot Glue

Tools needed for fabrication of the OSAT[edit]

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

Skills and Knowledge Necessary to Make the OSAT[edit]

  • None

Print Instructions[edit]

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]

  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]

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

Cost savings[edit]

  • 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 [24 in Guard]