I made this, while learning to use Blender and Luban together.
It is a simple grommet for passing the filament from the outside of the Enclosure V1.1, but I imagine the V1.0 Enclosure is the same.
Useful, and so far it has done great, not catching on the filament at all.
I found that if I reverse the inside dome, and leave it a little loose, the filament follows the print unit a lot better, and does not struggle to feed. The outside dome needs to still be flat against the enclosure, and glued to the tube, so it does not fall apart. The inside dome does not use glue (unless you’re ok with making this a permanent part of your enclosure).