Tell us something we don’t know, or ask a question about what you don’t!
To begin with, the Bullet is a great roaster. No doubts about that. Having said that, in retrospect, it was perhaps designed as a prosumer offering with a high enough batch size that did not require back to back roasts very often, and if required, very possible. Contrary to that assertion, I guess, it has become the roaster for many micro roasteries.
One thing in particular that I would like discussed more in the forum is residual heat and its impact on roast consistency over multiple back to back roasts. This may not be an issue during one-off roasting, but is an important consideration when doing back to back roasts. Connected to this is another topic: IBTS and BT vs IBTS and Exhaust T.
Doing a bit of research, residual heat appears to be a major consideration in coffee roasting and each manufacturer seems to have their own ways of addressing it - from very thin drums that do not retain much heat between batches to very thick ones that do not lose much heat, once properly pre-heated.
The IBTS, especially in the AIO, is perhaps in the cutting edge as far as sensors are concerned. It’s very accurate in reading surface temperatures and great for setting milestones and monitoring the roasts. However, the BT is also doing the same thing, measuring the temperature of the beans. So, I often feel, that we have two sensors in the Bullet that are measuring the same thing. Having installed an Exhaust Air probe, I wonder if an IBTS and ET would be a more useful setup. An ideal case would be an IBTS, ET and BT, which I believe is what the R2 brings.