Robo 3D 25mm to 40mm fan adapter for hotend

I found that 25mm fan is much harder to get than 40mm. If you even find it, it is much more expensive.

I decided to use 40mm fan instead of 25mm, thus I had to create this adapter.

Note that after mounting you need to replace also X endstop screw to be about 4mm longer in order to prevent 40mm fan hiting vertical Z rods.