I read about a Parrot Bebop issue here:
https://community.parrot.com/t5/forums/v3_1/forumtopicpage/board-id/Bebop_EN/thread-id/15301/page/1
There was a problem that the drop suddenly drops its height when it's facing to the sun. This little piece of plastic eliminates the issue because it covers the barometer from the UV radiation.

MakerBot

MakerBot Replicator 2

Yes

No

0.2mm

10%