Active Cooling Vent (Right Side Only) Replicator/Duplicator/Creator/CTC

Bassna remixed thruit00's cooling vent, and disabled the left side. Good! I don't have a left extruder on my FlashForge 95% of the time, so this works well. BUT, Bassna left some extra mass on the part (womp-womp, I'm always trying to save on gantry weight), as well as a tiny vent still pushing air to the unused side (tsk!).
Nice thing about thingiverse, I don't have to whine, request a remix, wait for a V2.45, whatever. Just remodel and share.

So, this is a right-side-only extruder fan (mir