Based on Sterling's nice design, but truncated so that it fits the fan in the original horizontal mounting position, and without disturbing the Z-axis clearance.
Should print nicely with no cleanup and no support needed. Held down by the two separate M3 screws that holds the fan duct - you may need 20 mm long screws, though. The cover is also 2 mm thinner than Sterling's version - the strength should be the same.
(If you did not make your own fan duct yet, consider doing so, the standard item has a tendency of interfering with your print after a while. The design in thingiverse.com/thing:25611
is a good example.) Fan grill for standard Ultimaker
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5.2 w x
4.2 d x
2.047 w x
1.654 d x