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SSRs are fundamentally on/off only, but they are usually fast enough that they can do this at an AC per-cycle (or even faster, i.e. phase angle control) level. There seem to be mixed reports about the success of using SSRs and "fast" unsynchronized PWM to control AC devices. Heaters are much...

Not really serious, but maybe you could use a servo to turn the speed knob ... :)

OK, I uploaded the two STL files to Thingiverse.com and edited the original post to add the link. This should be really easy to print as there are only two overhang areas (inside the two posts with the mounting bolt holes). The hex nut hole is sized for an M3 nut. I've attached the damper box to...

I gave this a very quick try while the grill was still hot: With the blower disabled and the damper fully open, my configuration is not able maintain 225F (temp falls quite rapidly). For damper-only operation you'll need something that doesn't restrict the airflow as much. I think there have...

I haven't tried just using vent control on my Primo. I did a low-temp cook (tri-tip roast) at 225F tonight: Looking at how much of the time the fan is off and the damper fully closed (blue graph at the bottom), I think a damper-only control could work fine, but maybe not with the additional...

The fan works fine for me from 1% to 100%, no problems. I'll post a link to the STL files as soon as possible. Will probably post the OpenSCAD source, too, once I've cleaned it up a bit for public consumption ;-) Steffen

Hi, I recently built a HM 4.2.4 with thermocouple and it works really well on my Primo L. Initially, I had started my journey into BBQ temperature control with a BBQ Guru CyberQ and I already had their 10cfm blower and adapter plate. The CyberQ works quite well, but one of the main limitations...

Sure: The outer diameter is 35mm. And the length of the tube is 32mm. Steffen

I just measured: The inner diameter of the round pipe is 31mm (1.42in). If you have their blower you might also be interested in the intake-side damper I just designed and tried out yesterday. Will post details later today. Steffen

Ralph, I'd be interested in trying out the RotoDamper and sent you an email earlier today asking for the files. I recently built a HM 4.2.4 and it works very well controlling a BBQ Guru blower on my Primo L. Still, it would be nice to not have to adjust the manual damper ... Steffen