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The chain I purchased was listed as 3.2mm, although I think it is a bit different from the style from JohnA's. The changes were made using his scad file, please refer to it if more changes are needed.
This is part of a Polargraph:
Ball-Chain Pulley for Polargraph by NickRBrewer is licensed under the Creative Commons - Attribution license.
So what's this mean?
We're sure NickRBrewer would love to see what you've printed - take a photo and share it on Thingiverse as a Make.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. You can also download the Thingiverse Mobile app (available via Google Play and Apple App Store) to take a photo and upload your Make right from the app!