I don't like the behaviour of FB too, but on the other hand, I would not have so many customers without FB.
The thing with non profit discussion groups is, that commercial interests are often not tolerated there.
And you have a business too, David, and without us FB nerds, who shamelessly promote and advertise YOUR (and other good) products too in our several groups, you would sell a lot less Duets. Alone your german dealer sold dozens of Duet Wifi alone in the last few weeks by recommendation in our german FB group. Like it or not, that is a fact too, no matter that Zuckerberg makes profit with our data. Thats because the majority of people (and our customers) uses FB the most and they prefer it over other communication platforms.
Whatever you personally think of FB, it still helps keeping YOUR business going too. And that goes for many small companies / start ups, who would sell a lot less without FB.
I am in my sixties (old fashined too) and still prefer other ways of communication, but I have to live with the things, that a bunch of other people use on a day to day base, if I want to keep my business going...
$150 for a clone is still a substantial chunk of coin and will be a deterrent, but people will buy them.
Yes and maybe not even on purpose. Since the clones even carry the Duet logo etc it is only a question of time for the clones to show up in "more unquestioned" shops. It is not the making of these boards, but the pretending to be genuine that makes this method of selling criminal. I say that warnings of this counterfeit need to be seen on all original Duet related websites, including a method of determining genuinity (is that even a word?).
I've had the occasional problem with this also, but for me, I put them mostly on the duet misbehaving, or me,as it only seemed to happen when I turned on the machine, and a clean power cycle cleaned it up. I really haven't had an issue since I finished up my wiring, and I've never seen it fault through multiple prints.
We added the flyback diodes in PCB revision 1.02 because a few users had connected BerdAir or similar water pumps to fan outputs without using a flyback diode, which damaged the mosfet. Ordinary brushless fans do not require flyback diodes, but brushed DC motors do.