mikemikemike you say for pellet smoker Rec Tec is best. Yet he was talking for electric.

KillerNoms I have the MB40 also with the Auber PID WiFi controller. It works awesome. I thought about the fan also. Do you have pics of your fan inside the MB40?

I also have the Auber WiFi PID controller. It has an easy mod to use it. It is basically one jumper wire for mine. My Masterbuilt was also having the crazy temp swings and inaccurate temps. I contacted Masterbuilt and they finally sent me a new controller, but I decided to go with the PID controller instead. The great thing about the Auber WiFi PID controller is it doesn’t have to be used only for a single smoker or unit. It can control other things also. Well worth the investment.

For the Masterbuilt look at getting a Auber Wifi PID controller, it works awesome, very accurate and stable temps. Also look at getting a cold smoke attachement, much better smoke for hot smoking plus added benefit of being able to cold smoke. Electrics are notorious for having trouble producing smoke at lower temps. A alternative to cold smoke attachment would be to make a Mailbox mod for the smoker. It does the same thing.