Hello and thank you for reaching out. Hmm … at this time I consider the “open source coffee roaster” rather an exploratory exercise. We have more than enough to do with our current project, the open source coffee sorter (with a first machine supposed to be ready by 2018-04-30).
For our (= @anu and me) roastery project in Nepal, we intend to buy a simple mechanical roaster from an Indian manufacturer and will later extend it with open source electronics (Artisan Roasterscope, see the article above). To me, this seems a good compromise for a self-repairable, self-manageable, low-cost small roaster.
A fully open source roaster would still be better of course. You are welcome to take over the idea, it’s open source after all 