Same but different...

[Angela]

Interesting take on the functionality of hot air roasting https://www.alibaba.com/product-detail/Hot-Air-Coffee-Bean-Roasting-Machine_62047617927.html

Exhaust air is a problem for all designs so far.

Has rudimentary process control (human). Price for 1 is $520 US ~ 790 $NZ

[Damian]

I like the clear chamber and how it detaches.
Attaching probe/s is more challenging, but being able to see the beans change colour and their turbulence would be very useful.

[Angela]

Yes, unsure about the probe. It has a temperature readout so there must be a probe - in the inlet airflow I imagine.
All the DIY rigs on YouTube have clear glass.

[Damian]

I went to a coffee shop not long ago, they had a large air roaster on display, front of shop. Clear chamber. Unfortunately they weren’t roasting while I was there, would have been cool to watch.