Ultimate GREEN DIY Trackball Mouse From Junk : 10 Steps (with Pictures) - Instructables
DIY trackball prototype : r/Trackballs
Autodesk ASEAN on Twitter: "#DIY trackball design is easy with @AutodeskReMake and @adskFusion360: https://t.co/CbXtyZPnQD via @hackaday https://t.co/mCSiBZuLiX" / Twitter
Home made Trackball
The Cheapest Way to Convert Optical Mouse Into a TrackBall | Optical, Converter, Mouse