Knitting Weight Containers Parametric (For Circular Knitting Machines)

January 24, 2025: Original Code was done in OpenSCAD2023.  Apparently this code does not respond gracefully with older versions of OpenSCAD like version 2021.  I have modified the code and uploaded another .scad file for this project that is compatible with OpenSCAD 2021.

License: Knitting Weight Container Parametric © 2023 by DaniAngel is licensed under CC BY-NC-SA 4.0

I built a circular knitting machine that was compiled and upgraded by JeepingJohnny.  A considerable amount of weight is needed to pulled the knitted material through the cylinder and to keep the needles operating properly and prevent losing stitches.  

I designed these parametric knitting weight containers to hold ballast.  I am using ¼ " ball bearings but you can using nuts, lead shot, etc.  There is a formula in the openscad file that will calculate proper dimensions based upon ¼" ball bearings.  If you use another type of weight ballast, such as lead shot, you will need to change the variable, “VolumePerGram” to use this formula.  Instructions for using this formula is contained in the comments in the .scad file.

Note: This .scad file requires the use of threads.scad, a thread library file created by Dan Kirshner.  You can download his library here: https://dkprojects.net/openscad-threads/

After trying various amounts of weight, I find myself using 5 pounds most often connected to the weight buckle.  If you need a weight  buckle, I designed the one here: https://www.printables.com/model/382347-knitting-machine-buckle-for-csm-ver-12-parametric

I use 1.75 pounds of weight attached to heel forks.  I have also included a 3 pound weight container as part of the .stl files.

I printed my containers from PETG, 4 perimeters, 20% gyroid infill, 4 layers top and bottom, at 0.2 mm layer height.  Other materials may work for you just as well.  keep in mind that the heavier the weight, the stronger you want the container.  

To hang the weights, I use a section of 550 paracord.  See photos.  the channel in the bottom of the container is so that the paracord supports the weight from the bottom.  

If you use this creation, please consider posting your make and giving me a "like" by clicking on the heart icon.  Any suggestions or concerns, please let me know in the comments section.