About this device
Screen Shot 2018-12-06 at 3.33.30 AM.jpg
Keywords 3D printing, ergonomic tool, nut cracker, walnuts, osat
Uses agriculture, development, industry
Authors Bharath Sadashivaiah
Status Designed
Made? Yes
Replicated? No
Published 2018
Designed in Michigan, United States
Affiliations MOST
Cost $ 2.00
SDGs SDG08 Decent work and economic growth
License data
Hardware CC BY-SA 4.0
Instructions data
Manufacturing files https://www.youmagine.com/designs/walnut-cracker-40-28
Translation data

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.

Bill of Materials[edit | edit source]

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

Tools needed[edit | edit source]

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

Skills and knowledge needed[edit | edit source]

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

Technical Specifications and Assembly Instructions[edit | edit source]

  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 | edit source]

Parts walnut.jpg
Print out the parts
Img2 walnut.jpg
Insert the peg between press_cylinder and support_arm.
Img3 walnut.jpg
Insert the peg between the upper support arm and the handle.
Screen Shot 2018-12-06 at 3.33.30 AM.jpg
Insert the last peg between the cylinder and the handle
Image walnut.jpeg
Completed Prototype

Common Problems and Solutions[edit | edit source]

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

Cost savings[edit | edit source]

  • 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 | edit source]

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