Skirt and inner mounts for bell jar

Skirt and inner mount for bell jar.
In the pictures the skirt design helped in shielding the base of a vented bell jar from fume hood air flow. The inner mounts were glued to the glass so that a tube can be threaded.

This design was used in the following publication: https://doi.org/10.1021/acsearthspacechem.2c00328

Print 4 times and glue the pieces together to get a full circle (33.3 cm ID).
There are two skirt designs, one with a hole (1.1 cm ID) and one without it.