Who here uses a popcorn popper to roast? Tips/tricks/words of caution would be greatly appreciated. Can't swing $200 for even an entry level roaster right now, but I'd sure like to give it a shot.
I've been using a popcorn popper for a few years, like you I just can't swing the $$$ for a roaster.
The popper works very well and there are plenty of mods you can do to make it better.
One key thing is the type of popper, not brand but how the hot air enters the chamber. You need the one with the fins on the side, not the screen on the bottom.
It's pretty straight forward, turn it on and add beans until they just stop spinning in the bottom, use a wooden spoon or the like to give them a stir until they start moving by themselves, put the top on. I do this outside as the chaff does go all over the place. I have done it in the kitchen a few times, under the vent hood that vents outside and I just put a large bowl with wet paper towels as a liner and just about all the chaff was kept contained.
When they start Second Crack (I mainly use them in my Giotto ECM espresso machine), I turn it off and dump the beans into a metal colander and blow some air on them to cool them off quickly, they will continue to "cook" if you just leave them in a pile, spread them out.
Also the ambient temp will hinder the process if it's to cold out.
If I didn't answer your questions, let me know.