This recently turned up for me from Banggood.. a great new case for the Raspberry Pi 3 Model B, complete with coated copper heatsink and DUAL fans. Something new every day!!
The dual heatsink is great if a little bit of a tight fit, I like the case and already it has the job, it is now protecting my main Pi3. The fan connector plugs straight into the PI.
In case you were wondering, the Perspex IS clear, in the top photos I’d not yet removed the thin protective covering. I did eventually but not without some wear and tear on my fingernails.
And here it is, done, dusted, complete with my PI3B and a handy 128 x 32 OLED display, running my home control and Pi-Hole, PIVPN along with Node-Red and so much more. The fans are very quiet in operation. I like it.