Just received my new Feathertouch fine focuser knobbys 3D printed by Meru and Co. Very, very happy with them. I used a hot air gun to snuggly fit it on and it looks like I wont need the "just in case" grub screw. Looks and feels very accurately made and the serrations on the outside match very well with the Feathertouch coarse focuser knobs. I think they are going to be great.
Sorry Meru, I want/need a 3D printer now