We start with the processor heat transfer first.
Throw away the stupid 4mm silicone pad and put some heat transfer paste on the processor. Then we take a 10mm x 30mm 3mm copper M2 SSD cooler what we have left over from screwing around with an apollo lake ultra book.
Over that comes a very thin double sided thermal transfer tape to keep the sheet metal in place.
No we need to keep pressure directly over the processor. This is done by 3 washers what sit around the mounting pin of the sheet metal cooler.
but this brings the pressure not directly on the processor so the mounting pin meets the dremel.
Then the 3 washers are getting reduced to 2 and since I drilled a bunch of holes into the bottom earlier to test if just simple swiss cheese methode would work (it did not enough) the 3rd washer gets replaced with a 1mm slotted aluminum plate (remember the apollo lake, a leftover from my heat sinking there).
The washers get held in place directly over the processor by some aluminum sticky tape.
pictured the 3 washer stage.
The top gets the swiss cheese treatment since I found out that the topside from the board produces quite some heat too.
I wanted the look not too butchered up so I used some mounting band what has nice holes in equal spaces.
Also the logo should be not holed.
the holes were smoothed later on.
WIth this setup the box reaches 75C 167F playing for half an hour in a 29C 84F environment.
We are still takling under Android where the box runs between 80 and 100% Kodi processor load.
In CE we are at 60 C 140F and in cooler room conditions, around 22C 72F, the box runs 10C 50F cooler.
The inside of the box runs now with acceptable temps.
Both measured through the air holes onto the board in Android under load.
The bottom also got some feet extensions so there is now a good, and with the hand over the top noticeable, air movement going on.
Aliexpress got a claim that I get 19 Euro from the 38 Euro price back.
(I forgot that there was a keyboard what made the price a bit higher, so I might settle for 15 Euro back, for my work)
If everything works as it does now, I will glue some black fly screen from the inside to keep the bugs out of the box.
By the way, since the sd card slot just runs slow usb 2 speed with 25/18 RW I copied the sd card onto a 64GB Sandisk Ultra Fit usb 3.0 what runs over the 4 port hub with measured 140/50 RW.