The e3d mount I made to use myself. Can be used both on linear rails or back board. Print using ABS at whatever you can print without it warping. Min at least 20% infill. Places for nuts inside the mount. Before mounting this, put the (3mm) bolt and nut in test and glue/melt in the nuts. Takes a standard 40mm fan 40x40x(10/15/20). You won't need to print with supports. Just don't print too quickly.
Currently used with the linear rail mount I have in my thingiverse designs. Also have it on ebay for anyone needing it just sent to them. Pretty much at cost since just trying to help.
If you use it, post a pic. Would be nice to know others appreciate the time spent trying to add to the community :)
Any Abs you have laying around ABS
Note: Don't use PLA as it will warp near the hotend and even more so if you use an enclosure. (Just putting this note here in case you belong in Darwin's club)