@banchocanh It’s a cage roaster. Thanks for the tip. Of course with the popcorn maker the chaff just blows out the top.
Have you found a good mix of beans to blend?
I’ve got access to a home/DIY coffee roaster. Anyone searched for the cheapest beans around so I can practice? Green Bean House in the Wairarapa so far seems to offer the best deals on 1kg lots (start from $16.50/kg).