These are my revised fan ducts, they require no screws, they swivel out of the way giving clear access to the nozzle area and you can adjust the height, I recorded just over 6 m/s. If your running dual heads you can mirror the LH duct, what's not to like?

Oh they don't make the coffee!

If you are interested here is the link
https://www.youmagine.com/designs/um2-fan-duct-v2
Let me know if you do try them and how you get on
