Screen Shot 2018-12-06 at 3.33.30 AM.jpg
FA info icon.svgAngle down icon.svgDevice data
Manufacturing files
Hardware license CERN-OHL-S
Certifications Start OSHWA certification
FA info icon.svgAngle down icon.svgProject data
Authors Bharath Sadashivaiah
Status Designed
Completed 2018
Made Yes
Replicated No
Cost 2
Instance of Nut cracker
OKH Manifest Download

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

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]
FA info icon.svgAngle down icon.svgPage data
Keywords 3d printing, ergonomic tool, nut cracker, walnuts, osat
SDG SDG08 Decent work and economic growth
Authors Bharath Sadashivaiah
License CC-BY-SA-3.0
Language English (en)
Related 0 subpages, 3 pages link here
Impact 518 page views
Created December 5, 2018 by Bharath Sadashivaiah
Modified October 23, 2023 by StandardWikitext bot
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