Summary

Tired of mounting/unmounting your cooling fan? Try the Quick Removable Fan Holder.

Instructions

The remaining level hole for the M3 screw has to be drilled. It's designed this way in order to be able to print the level without support material. You need a M3x16mm hex screw and a M3 nut for the level.
You also need two M3x12mm screws, two M3 nut and two washer for the bar.
The FanHolderSlideB is mounted with a M3 Screw and a M3 nut. The second hole in the front is used to clamp the FanHolderSlideT with the level.