I needed a layer fan for my Graber i3 print.
Found many models on Thingiverse but most of them were too big or munted in a position that was not good, most of the time coliding with the Z axis as by alvaroalea Feb 28, 2017 thing https://www.thingiverse.com/thing:2143701 said.
Thanks to him I could join both pieces of his device in just one.
Now there is no need for glue, but support