Keychain não

I wanted a brain keychain as a novelty giveaway at a brain-related conference, and found the excellent https://www.myminifactory.com/object/3d-print-brain-keychain-50692, but it's annoying to print due to non-flat bottom and needless internal voids. This remix addresses both these issues.

Printed at 0.15mm layer height and the layer lines are barely noticeable.

No supports required.