Brad, with a mount of 77mm you will need a Vapla lensboard. Lenses up to 72mm mount can go into the Unipla, but you'll need the proper Lapla adapter...
I really admire good watercolor paintings. But artists in the past didn't understand paper conservation issues very well, and you run in to a lot of...
The accuracy of internal diameter I can verify with an inside micrometer. If printed with let's say 0.1mm layer thickness, and adjusting the extruder...