If you're one of those weirdos who cuts their own hair, it can be hard to get a good transition without leaving too much on the sides or taking too much off the top. This should make it a little easier.
Print it laying flat - requires tree supports, but not many of them.
Inspired by ReedFagan's thing 4909364, but I couldn't figure out how to modify that one, so I started from scratch
Only uploading a #6 guard, but it's easy to make new ones in the Fusion360 file:
round_trimmer_guard.f3d | 250.6KB | |
round_trimmer_guard_6.step | 185.1KB | |
round_trimmer_guard_6.stl | 116.3KB |