Anet A8 Extruder Fan Spacer

So I made this to get better access to the extruder:

https://www.thingiverse.com/thing:2551414

However, you can't mount it against the extruder with any of the leftover hardware (or with any of the assortment of M3 screws I bought). Everything's either too short or too long. You could use some of the leftover 8-mm (?) spacers, but they hold it out a bit too far. This 3-mm spacer will hold the fan closer to the extruder.

It also works anywhere you might need a spacer for one side of a