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Coffee tastes flat
Hello. I am new to coffee roasting and started with the popcorn popper. I mod it using power supply, dc speed controller and dimmer for the heat control.
Well, i roast some coffee (100g), i try to rise the temp from 130c to 215c every min or so, with FC around 9m30sec and 12min end of roast. Waiting 2 days for the coffee to degas, but in the cup it tastes blunt. What am i doing wrong?
Koffee Kosmo
Depending on the coffee origin
The degas process can take up to 14 days

For my taste I personally degas for a minimum of 5 days
Degas is best achieved in one way valve coffee bags

I home roast and I like it. Designer of the KKTO
Roaster Build information
Blog -

Bezzera Strega, Mazzer Robur Grinder, Pullman Tamper Convex,
(KKTO) Turbo Oven Home Roaster.
Roast faster, fluid bed is a machine that not likes longer roasts.
Start at 150C at least, better 175 C, and rise to 240 C in maximum 4 minutes. So you should bring FC in the 6-7 minutes ballpark, and finish in the minute 8-10.

Degassing is for espresso mainly, cupping is performed usually hours after roast and find there all the flavors, and some of them will vanish after three days of storage.
Edited by renatoa on 08/31/2022 8:59 AM
I will try to bring FC faster and see results. Then i come back with an update
I am having the same issue. I get perfect smells but the coffee is just flat with a hit of acid. My Ethiopian smells like citrus, my Brazilian smells like chocolate. They both taste the exact same. Ethiopian first crack at about 6:15 pulled at around 7:45. Brazilian was a 12oz sample roasted in an artisan 2.5 so fc at 5:15-5:30 and finished at 8:15.. just frustrating that all I am tasting is basically a hit of acid in dirty water, not at all a good cup. I've tried every brewing method but cold.

Ethiopian is now 9 days old, smell has gotten better all along but the flavor hasn't changed very much.
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