I really liked the original active cooling duct by Thruit, but I don't necessarily always want it on the printer.
Screwing it on was a good way of fixing it but was a little too permanent for my liking.
So, what I've done here has been to add a handle big enough to get a finger/thumb under the clip to pry it off easier. Then, by using a longer screw and a spring, means that I can just press the duct down whilst pressing the clip up and it'll pop straight off.
I'd suggest a high infill as it's got to be fairly strong!