ordered a case+fan from amazon will get here tonight. will comment how it fits tomorrow. EleDuino Raspberry Pi 3 and Raspberry Pi 2 Metal Case with Cooling Fan Black
https://www.amazon.com/Eleduino-Raspberry-Metal-Cooling-Black/dp/B012GPCLR6
Fits a little tight. Made from bent metal (steel) Fit could have been a little better. Putting in the 4 screws to hold the board down was a bit of a pain. Might try to use some set-screws and nuts if i use this case on another project.
I can see the sd card via a large notch on the bottom, and i think i can remove it without taking the case apart, but it may take some tiny fingers. There is a slot for wires from the gpio pins. A tiny screwdriver and some extra screws were included.
I had to use just 2 of the long screws to hold the fan in, the screws were just a bit too long and would not let the tinkerboard fit correctly.
The airflow seems to be in one side, around the board, then back out the back in a loop.
The fan is tiny, and quiet. No filter on the fan.
For the cost - it seems to be a solid case that can take a beating. About the only extra feature i would like, would be a led, or opening where you can see the lights on the tinkerboard to be sure its on.
I am not using wireless on my tinkerboard so no idea how this metal case affects it. The slot is near the wifi end of the board.
I am not sure how to measure temps on the tinkerboard, so cant really give any numbers for the temps. My tinkerboard just sitting bare on the desk was VERY warm today, (i was imaging 2 hard drives for several hours) So i will see if it feels any warmer later after doing some more work.
I'm a little late, but i used this one. Cooling is excellent, however the fan is a bit noisy. Fits perfectly with lots of room for the heatsink
https://www.amazon.com/iUniker-Transparent-External-Dissipating-Raspberry/dp/B01LXSMY1N