Andyroo wrote: ↑
Fri Aug 23, 2019 7:15 pm
Cost of injection moulding is not cheap and you would have lots of different fan mounts to cope with as a guess
Maybe as a kit with all bits would be the way to go.
It s a matter how many sell to amortize the cost of the injection mold. In the case of an alternate case lid, it should be possible to start from the design of the current lid, so while the molds would cost just as much, there'd only need to be one of them (or, at least, depending on how many molding machines, one per). And again, I point to the PoE HAT, which includes a fan...that appears to be 25mm.
I think it would be a good idea though and I’m surprised there is not one on the market already.
Well... The RPF Pi4B case is--one presumes--IP protected by the RPF and it hasn't been on the market very long, so I don't think the lack of an after-market, third party design is all that surprising.
I do wonder if the current case lid could be cut by laser to give a hole and mounting points for self tapping screws...
Almost certainly. It could also be done much lower tech: hand-held drill and dremel work. For me, it's a balance among looking good, my skills at the work, time to do the work, and just spending a moderate amount ($10? $15?) to be able to order as many as I think I might need.
Since the, rather more complex PoE HAT sells for $20 and the current two-piece case sells for $5, I think a case lid and fan would be reasonable in the $10 to $15 range. Obviously might be more if not many of them can be sold, or it could be less if they are very popular.
Just did a quick lookup... Here's a fan: https://www.adafruit.com/product/3368?g ... gJhR_D_BwE
from a not exactly cheap source. Note $3.50 each but $2.80 each in lots of 100. So being generous, $3 for the plastic and $3 for the fan, and (at a guess) $2 for assembly should make it possible to sell for less than $15, and certainly less than $20.
Edit to add... One fly in the ointment... I've never done much with GPIOs, so I had to look up the layout. It looks like the only two 5v pins are in the first six, so they get covered by the Rasclock RTC. Have to find somewhere else to connect to to get 5v for a fan....