The BIQU H2 is all about being as light and compact as possible. This fan mount has the same design criteria.
Prints best with a 0.4mm nozzle and in PETG, the extruder motor gets quite hot during use and it might melt ordinary PLA. Layer height should be 0.2-0.3mm. I recommend supports under the sharp splitters as shown using support enforcers.
Two short M3 screws are needed to fasten the mount to the extruder. The fan sits tight without fasteners but there is a hole for a 4mm fastener if required.
The motor on the extruder has to be rotated so that the wires do not interfere with the fan mount.
The author hasn't provided the model origin yet.