This is a Filter and Fan housing for the Ultitop Cover.
For a better print with ABS and other strong smell Filament.
Its work really Fine and i have much less smell!
You want more Designs and Models check my other Accounts:
Pinshape:
https://pinshape.com/users/94416-makethings3d#designs-tab-open
Thingiverse:
https://www.thingiverse.com/Marc_M/designs