Good news - we're open for limited services in Wembley. Ujima House is now actively under refurbishment and we'd love your help in making the space the best it can be.
During this interim period donations and continued membership are greatly appreciated while we transition to our new space.
As I still actively use it, I keep on improving little bits and pieces on the original design. The plotter is my learning platform - when I started, I had no idea how stepper motors work, and I didn't design electronics or programmed Arduinos for many years. Please bear that in mind while reading this page :) .
All resources (mechanical parts, electronics design, Arduino and Linux C++ code) live on GitHub - feel free to use it, reuse it and hack it. If you substantially improve on anything, or if you build something similar-ish, I'd love to hear about it!
The first working version, and a result of many iterations and failures. A presentation I made for the Arduino group can be seen here.
Improved electronics design - using substepping and current-limiting drivers significantly improved performance, accuracy, and made the plotter much much quieter.