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Nut Cracker

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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 Title[edit]

Project developed by Michael Warburton
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.


  1. This nutcracker is fully made with a 3D printer. Designed for high volume processing of a variety of nuts.
  2. Cracks many types of nuts, is hand operated.
  3. Increase financial mobility of poor nut farmers, by providing a low cost simple way to process their crops.

Bill of Materials[edit]

  1. Fully 3D printable. No extra parts needed.
    1. Link to all source files from open source CAD (https://www.youmagine.com/designs/nut-cracker-23-25)

Tools needed for fabrication of the OSAT[edit]

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. 1.75mm PLA Filament, 55g used

Skills and Knowledge Necessary to Make the OSAT[edit]

  • Not Applicable

Technical Specifications and Assembly Instructions[edit]

  1. Provide directions for print/assembly - be detailed enough in your “how to” to ensure that someone could construct the device from your description. Consider the elegance of IKEA like instructions.
  2. Printed in two pieces. One is the base, and the other is the strike. Assembly is easy, simply insert the strike into the top of the base.
  3. Cura estimate for this print is 2hr 38min @ 0.3mm layer height, 20% infill
  4. Pictures of the device at stage of assembly. (https://www.appropedia.org/File:Nutcrackerpieces.jpg)
  5. Video of Nutcracker in action.
Nut Cracker in action

Common Problems and Solutions[edit]

  • The nut may be to small for the strike to crack the shell. This strike was designed not to crush the inside of the nut, only the shell. The original scad file can be altered to change the size of the strike. Just enter the nutheight in the variable section. The end of the strike is concaved to prevent nut rollout.

Cost savings[edit]

  • If your solution is not a low cost one then it is not really appropriate.
  1. Estimated cost of this project is $0.99. 0.055kg @ $18/kg = $0.99
  2. Commercially Available Nutcracker [1]
  3. $8 in savings, 11% of the commercial price.


[[Category:How tos]] [[Category:Water]]