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Walnut 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.

Walnut Cracker[edit]

Project developed by [Bharath Sadashivaiah http://www.appropedia.org/User:Bsadashi]
This OSAT has been prototyped.

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


  1. Dried nuts such as walnut are grown in countries like Brazil and India Predominantly. The farmers are usually small land owners with little to no requirement for machinery. For these small scale farmers, cracking walnut with hand crusher is a tedious task and to overcome the issues of ergonomics and usability, the following walnut cracker is designed.
  2. Walnut Cracker prototypeImage walnut.jpeg

Bill of Materials[edit]

  1. PLA filament- $2
    1. https://www.youmagine.com/designs/walnut-cracker-40-28#information

Tools needed for fabrication of the OSAT[edit]

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. PLA Filament

Skills and Knowledge Necessary to Make the OSAT[edit]

  • If you used special skill – link to relevant wikipedia or wikiversity articles/courses

Technical Specifications and Assembly Instructions[edit]

  1. From the above mentioned link of Youmagine,, Download all the STL files and print one of each stl file with infill of more than 30%.
  2. Time to assembly is less then 5 minutes

Steps to Construct[edit]

1. Print out the parts

Parts walnut.jpg

2. insert the peg between press_cylinder and support_arm.

Img2 walnut.jpg

3. Insert the peg between the upper support arm and the handle.

Img3 walnut.jpg

4. Insert the last peg between the cylinder and the handle

Screen Shot 2018-12-06 at 3.33.30 AM.jpg

Common Problems and Solutions[edit]

  • Weld the pegs shut at the ends by using a little heat so that they stay in place.

Cost savings[edit]

  • Commercially available solution cost upwards of $60.
  1. The cost to print this device is $2
  2. Saves the user anywhere between $58 to $80 and hence this device costs only about 3% of the commercially available version
  3. commercial model [1]

Benefited Internet Communities[edit]

  • Small scale agriculture [2]
  • Food and agriculture [3]