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Cotton to yarn maker

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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.

Title of the device or system

Project developed by Ajit Thachireth
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 is a cotton to yarn maker. Also known as Indian charkha. Cotton obtained from the farm can be extracted into yarn with this tool. originally made of wood, Using 3D printer this tool can be made and put into use. The yarn can be used as threads in the textile industry
Cotton extractor(yarn maker).jpg

Bill of Materials

  1. 3-d printed cotton to yarn maker
  2. cotton
  3. bolt; used as a shaft for the wheel to spin
  4. needle to spin a yarn around it

OpenSCAD and STL files can be found here: | yarn maker


Tools needed for fabrication of the OSAT=

  1. MOST Delta RepRap or similar RepRap 3-D printer
  2. A File, only if needed to file the printed part.

Skills and Knowledge Necessary to Make the OSAT

  • Basic Open Source CAD skills
  • 3-D printing skills

Technical Specifications and Assembly Instructions

  1. Download the STL file from the link given in the Bill of Materials.
  2. Convert the STL to a gcode file using Cura.
  3. Print the files using Cura or any other related software.
  4. Once the part is printed, remove it from the bed.
  5. Assemble the different parts using bolts and nuts viz the base, the wheel, the needle stand, the wheel handle, spindle
  6. the wheel fits on one end and the needle holder fits on the other, use a large width needle to fit the spindle on the needle holder
  7. Use a cloth or thread like a belt conveyor assembly around the wheel and spindle
  8. using the handle on the wheel rotate the wheel to see its tightly fit or else tight the thread little more tight
  9. now use a cotton at the end of the needle; rotate the wheel, cotton will extract into threads on the needle
  10. bigger the wheel to spindle distance times the rotation can be achieved.
  11. The CAD and STL files are uploaded and can be modified according to the dimensions
  12. The print time is anywhere between 3-4 hours depending on the size of the tool and the print speed given and the assembly time is 20 min.

Common Problems and Solutions

  • Each part needs to be printed separately
  • for the bigger wheel to spindle distance the print bed is small; Solution is to snug fit bases for the bigger wheel to spindle distance
  • the needle around the spindle needs to rotate with the spindle; which may not because of the smaller needle; solution use a rubber bush

Cost savings

  1. Cost of printing is not more than 4$.
  2. commercial equivalent is around 100$

Benefited Internet Communities

*Requests for OS 3D Printable Objects


  • Concept was inspired from this video. [1]