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Parametric quick release buckles

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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.

Parametric Quick Release Buckles[edit]

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

You can help Appropedia by contributing to the next step in this OSAT's status.


Buckles are very useful and found on a wide variety of items; however, if one breaks, it is hard to find a cheap replacement. Since buckle sizes vary depending on the application, I made a fully parametric OpenSCAD design. There are several other buckle designs available, but none of them can be scaled easily; many of the designs found only provide STL files.

Parametric Buckle.jpg

Bill of Materials[edit]

  1. Filament (amount depends on size of buckle)
  2. Design files (OpenSCAD and STL): | Youmagine Link

Tools needed for fabrication of the OSAT[edit]

  1. MOST Delta RepRap or similar RepRap 3-D printer

Skills and Knowledge Necessary to Make the OSAT[edit]

  • Knowledge of OpenSCAD is needed to manipulate the parametric settings in order to customize the buckle (such as changing the buckle width in the code to match application).

Technical Specifications and Assembly Instructions[edit]

  1. Print Settings
    1. Male Buckle: 30% infill, 0.2mm layer height, 60mm/s print speed, print with prongs flat on bed. No support needed. Print at 210 degrees Celsius for PLA.
    2. Female Buckle: 30% infill, 0.2mm layer height, 60mm/s print speed, print flat on bed. Support recommended for the female casing; use Cura's "everywhere" support feature. Print at 210 degrees Celsius for PLA.

Buckle male print orientation.PNG
Buckle female print orientation.PNG
  1. Print Times (Varies on size of buckle)
    1. Male Buckle: 23min
    2. Female Buckle: 27min
    3. Overall time: 50min
  1. Assembly
    1. Estimated time: ~5-15min. This time accounts for removing supporting structure inside the female component and restitching fabric through the clips.

Common Problems and Solutions[edit]

  • The female buckle can be made without supports; however, this results in a buckle that is easily susceptible to wear and tear. Using Cura's "Everywhere" support feature makes the buckle more robust.
  • Make sure to take time to clear the female buckle of support material before trying to use it. Failure to do so will result in a hard to use buckle.

Cost savings[edit]

  • Cost estimate uses the base STL files on Youmagine. Varying buckle sizes can result in different costs and savings due to the parametric nature of the project.
  1. Total cost: $0.46 (20 grams PLA)
  2. Commercial Part: $0.82 - $6 + S&H [1]
  3. Minimum savings of $0.36 (43.9% savings)


  • Used as inspiration for design. [1]
  • Used as reference for OpenSCAD design. [2]
  1. web page: Thingiverse Male Strap Buckle Clip Available: http://www.thingiverse.com/thing:1416
  2. web page: Snap-fit Clips Available: http://www.appropedia.org/%22Backpack%22_Snap-fit_Clips