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"Backpack" Snap-fit Clips

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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.

Project developed by User:Rmputzig
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.


This type of clip is found on a variety of items, most commonly backpacks, and work well. However, I have found that if you break one, it is difficult to find a replacement, and are overpriced (typically $2-6 for 1 set!). Since it is made of plastic and only plastic, I wanted to make a parametric OpenSCAD design. There are many designs for there out already, however few provided source code and even fewer were scalable.


Bill of Materials[edit]

  1. Filament of your preferred color
  2. Design files as found here

Tools needed for fabrication of the OSAT[edit]

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. Exacto knife or similar product for removing support structures

Technical Specifications and Assembly Instructions[edit]

  1. Print out the part. Be sure to generate supports for the print. Be prepared to spend time removing the the support structures.
  2. Print time: ~40 mins.

Cost savings[edit]

  1. 3D printed part: ~50 cents (depending on size)
  2. Commercial part: $2-$6
  3. Minimum cost savings of 75%