I use @BaGooN's fantastic hotend fan guard on all my Mk3S printers. Better than any other fan guard I've tried, so naturally I wanted one on the Mk4 too. Here it is, with added openings for the two screws that hold the fan in place.
Update 01-25-2024: Version 2. Adjusted height of the locking clip to make for a better fit. The previous one was okay but came off too easily.
Print in PETG, ASA, PC, etc., and click on.
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The author remixed this model.
Adjusted for Mk4